Brexit: Corbyn releases leaked government documents that show Boris Johnson ‘lied about deal’

Jeremy Corbyn has unveiled leaked government documents that appear to show Boris Johnson misled the public over the nature of his new Brexit deal with the EU.

Labour says the internal Treasury paper, marked “official sensitive”, warns of new customs checks between Britain and Northern Ireland after Brexit – which the prime minister has claimed would not exist.

Speaking in central London on Friday, Mr Corbyn told journalists: “Today I can reveal further hard evidence that Johnson is deliberately misleading the people”.

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He added: “This document is very ominous. There will be other secret reports like this one in every government department that reveal the disastrous impacts of his policies on the safety of the food you eat, on the rights you have at work, on the pollution of the air that we breathe and on the jobs and industries that people work in.

“These reports exist but the government is hiding them from you because in this election the Conservatives want you to vote blind.”

Shape Created with Sketch. General election: On the campaign trail Show all 107 left Created with Sketch. right Created with Sketch. Shape Created with Sketch. General election: On the campaign trail 1/107 Britain's Prime Minister Boris Johnson visits a Christmas market in Salisbury REUTERS 2/107 Liberal Democrat Leader Jo Swinson on the election campaign bus on route to Chelmsford PA 3/107 Labour leader Jeremy Corbyn talking to a university worker outside Birkbeck/SOAS University of London, at the announcement of his parties of the plan for the extension of workers' rights PA 4/107 Nicola Sturgeon plays a game with string during a visit to Perth and District YMCA Getty Images 5/107 Brexit Party leader Nigel Farage picks up a copy of The Brexiteer during a visit to JPI Printers in Dinnington PA 6/107 Boris Johnson, centre, talks to veteran James Gammer as he visits a veterans centre AP 7/107 SNP supporters meet First Minister Nicola Sturgeon following her address during a St Andrews day election speech Getty 8/107 Jeremy Corbyn has a photo taken outside Birkbeck/SOAS University PA 9/107 Liberal Democrat leader Jo Swinson during a visit to the Cardiff United Synagogue PA 10/107 Brexit Party leader Nigel Farage reacts as he attends an election debate ITV/Reuters 11/107 Jeremy Corbyn wears a jacked displaying Labour's slogan 'For the many, not the few' EPA 12/107 Prime Minister Boris Johnson on The Andrew Marr Show Getty 13/107 Nicola Sturgeon plays with local children during a visit to the Jelly Tots & Cookies Play Cafe in Uddingston, South Lanarkshire PA 14/107 Opposition Labour Party leader Jeremy Corbyn eats some chips in Whitby, northern England AFP via Getty 15/107 Boris Johnson and Conservative MP George Eustice, left, tour 'Rodda's Clotted Cream' whilst campaigning in Cornwall Getty 16/107 Jo Swinson during a visit to Dunkertons Cider Company, an organic and plastic free brewery in Cheltenham PA 17/107 Jeremy Corbyn holds up unreacted documents with NHS staff. Mr Corbyn released uncensored official documents which he says provides confirmation that the NHS is on the table in trade talks with the USA EPA 18/107 Nigel Farage meets locals in Barnsley market PA 19/107 Nicola Sturgeon launches the SNP's general election manifesto Getty 20/107 Labour Party leader Jeremy Corbyn addresses the audience during the launch of Labour's environmental policy in Southampton Getty 21/107 Boris Johnson tries an apple as he visits Healey's Cornish Cyder Farm in Callestick AP 22/107 Jo Swinson helps make a chicken tikka masala during a visit to the Ashoka restaurant in Bearsden, Glasgow PA 23/107 Nigel Farage playing golf on a range at One Stop Golf in Hull PA 24/107 Jeremy Corbyn addresses the audience during a climate emergency rally in Falmouth Getty 25/107 Liberal Democrat leader Jo Swinson meets supporters during a visit to Dunkertons Cider Company PA 26/107 Boris Johnson visits Chulmleigh College AP 27/107 Labour Party leader Jeremy Corbyn as he appearing on the BBC political programme The Andrew Neil Show. The opposition leader defended his handling of anti-Semitism allegations after Britain's most senior rabbi suggested the issue was a "new poison" within the party that had been "sanctioned from the very top". In an unprecedented intervention ahead of next month's election, Chief Rabbi Ephraim Mirvis suggested Corbyn was "unfit for high office" due to his perceived failure to clamp down on the problem within the party BBC/AFP via Getty 28/107 PA 29/107 Prime Minister Boris Johnson launches the Conservative Party Scottish Manifesto in North Queensferry Getty 30/107 Britain's Opposition leader Jeremy Corbyn poses with WASPI (Women Against State Pension Inequality) supporters after he outlined Labour's plans to repay the "historical debt of honour" owed to women born in the 1950's AFP via Getty 31/107 Jo Swinson alongside the Lib Dem's candidate for Truro and Falmouth, Ruth Gripper, and founder of Finisterre, Tom Kay, during a tour of the British surfing brand, which creates sustainable surfing gear, in St Agnes, Cornwall PA 32/107 Prime Minister Boris Johnson poses with sheep as he visits the Royal Welsh Showground, in Llanelwedd PA 33/107 A coalition of NHS (National Health Service) campaigners led by "Keep Our NHS Public" and "We Own It", pose for photographs with masks of US President Donal Trump, right, and Prime Minister Boris Johnson carving up the NHS with a giant knife and fork, as they take part in a demonstration on Parliament Square. The campaigners are calling for the NHS to be taken "off the table" in a trade deal with the US by ending privatisation in the health service and restoring it to a wholly publicly owned and provided service AP 34/107 Brexit Party leader Nigel Farage visits Plymouth Fisheries at Sutton Harbour Getty 35/107 SNP leader Nicola Sturgeon gives her party's candidate for North East Fife Stephen Gethins a haircut, during a visit to Craig Boyd Hairdressing in Leven PA 36/107 Vans belonging to The Community United against Labour Party anti-Semitism group, Culpa, parked next to a police car ahead of the Labour Race and Faith Manifesto launch Getty 37/107 Boris Johnson prepares to serve food at the Royal Welsh Showground PA 38/107 Jeremy Corbyn tries his hand at bricklaying during a visit to the West Nottinghamshire College Construction Centre, in Ashfield PA 39/107 Liberal Democrat leader Jo Swinson during a visit to the London design museum to discuss the party's tech policy PA 40/107 Brexit Party leader Nigel Farage visits Seaham Getty 41/107 Britain's Prime Minister Boris Johnson arrives for the Conservative party's manifesto launch in Telford Reuters 42/107 Labour Party leader Jeremy Corbyn meets supporters during a visit to Thurrock in Essex PA 43/107 Protesters wait for the arrival of Prime Minister Boris Johnson ahead of the launch of his party's manifesto PA 44/107 Jo Swinson gestures from atop a crane during a visit to an eco home building site in Sheffield AFP via Getty 45/107 Jeremy Corbyn meets a supporter on a train on his return from a visit to Sheffield PA 46/107 Prime Minister Boris Johnson during a visit to Bassetlaw District General Hospital in Worksop, Nottinghamshire PA 47/107 Nigel Farage campaigns in Hartlepool Getty Images 48/107 Jeremy Corbyn outside an Amazon depot in Sheffield, to announce plans for a workers' rights revolution and to ensure big businesses pay their fair share of taxes PA 49/107 Prime Minister Boris Johnson, Liberal Democrat leader Jo Swinson, First Minister of Scotland Nicola Sturgeon and Labour leader Jeremy Corbyn, during their successive appearances on BBC Question Time Leaders' Special at the Octagon in Sheffield PA 50/107 Liberal Democratic Party leader Jo Swinson visits a primary school in Cambridge EPA 51/107 Boris Johnson lays a brick during a visit to the Barratt Homes Getty 52/107 Labour leader Jeremy Corbyn attends the launch of the party's election manifesto at Birmingham City University Getty 53/107 Brexit Party leader Nigel Farage holds his party policy document during the party's policy launch in Westminster PA 54/107 SNP leader Nicola Sturgeon joined Dundee East candidate Stewart Hosie to made a keynote speech at The Quay Getty 55/107 Prime Minister Boris Johnson holds a part of an electrical appliance during a General Election campaign trail stop at Ebac in Newton Aycliffe AP 56/107 Jeremy Corbyn poses during a visit to The Oatcake Boat on the Trent & Mersey Canal, Stoke Getty 57/107 Jo Swinson and Willie Rennie Leader of the Scottish Liberal Democrats gesture, during a visit to Glasgow Reuters 58/107 PA 59/107 Liberal Democrat leader Jo Swinson (left) during a visit to the Gurdwara Singh Sabha Temple in Glasgow PA 60/107 Labour leader Jeremy Corbyn meets Colin and his mother after a speech at the University of Lancaster Getty Images 61/107 Britain's Green Party co-leaders Jonathan Bartley, Sian Berry, and deputy leader Amelia Womack, wave during the launch of the party manifesto at the Observatory at London Wetland Centre Reuters 62/107 Scottish Nationalist Party leader Nicola Sturgeon meets voters and activists at Cafe Roma in Clarkston, Glasgow AFP via Getty 63/107 Protestors participate in an anti-Boris Johnson rally in his constituency Uxbridge, west London AFP via Getty Images 64/107 Brexit Party leader Nigel Farage looks out from a window on the Kestrel crabbing boat in Grimsby fish dock PA 65/107 Prime Minister Boris Johnson on a tug boat in the port of Bristol PA 66/107 Green Party Co-Leader Sian Berry has a selfie taken with a supporter at the Observatory, London Wetlands Centre PA 67/107 Jo Swinson helps chef Leonardo Mastofilippo to make pizza during a campaign visit to cafe Amisha in South Bermonsey EPA 68/107 Labour leader Jeremy Corbyn with WASPI (Women Against State Pension Inequality) ladies during a visit to Birkenshaw Sports Barn in Uddingston EPA 69/107 Boris Johnson at the unveiling of the Conservative Party battlebus in Middleton, Greater Manchester PA 70/107 Nicola Sturgeon sits alongside Cycling Without Age user Cyril Corcoran (centre), aged 78, in an electric tricycle during a visit to Hawick, in the Scottish Borders PA 71/107 Nigel Farage holds a fish during a stop at the Grimsby Seafood Village PA 72/107 Liberal Democrats leader Jo Swinson in the boxing ring at Total Boxer, a specialised boxing gym which offers training to young people as a means of keeping them away from violence, in Crouch End, London PA 73/107 Britain's Prime Minister Boris Johnson reacts as he participates in a school art lesson, making a clay figure at George Spencer Academy, west of Nottingham AFP via Getty 74/107 Labour Party leader Jeremy Corbyn during a visit to the Heart of Scotstoun Community Centre in Glasgow PA 75/107 Scotland's First Minister and SNP leader Nicola Sturgeon visits the Cafe Gelato in Rutherglen, Glasgow EPA 76/107 The Green Party launch in Bristol PA 77/107 Farage enjoys some chips at the start of a nationwide tour for the 2019 general election, in Whitehaven AFP/Getty 78/107 Labour leader Jeremy Corbyn unveils the Labour battle bus in Liverpool PA 79/107 Boris Johnson reacts as he talks with workers whilst weighing packaged tea bags at the Tetley Tea Factory in Stockton-on-Tees AFP/Getty 80/107 Brexit Party leader Nigel Farage on the campaign trail in Whitehaven, where he was confronted by Karl Connor PA 81/107 Lib Dem leader Jo Swinson speaks to volunteer Rosie Squires in the Stainforth 4 All charity shop during a visit to Stainforth in South Yorkshire to meet people affected by flooding PA 82/107 Nicola Sturgeon poses with candidates during the SNP general election campaign launch in Edinburgh Reuters 83/107 Labour Party leader Jeremy Corbyn with Laura McAlpine, the party's candidate for Harlow PA 84/107 Anti-Boris Johnson protesters demonstrate outside the hall where the Conservative Party were launching their campaign in Birmingham EPA 85/107 Green Party Co-Leader Sian Berry (left), Deputy Leader and Parliamentary Candidate for Newport West Amelia Womack (right), and Bristol West Candidate Carla Denyer (centre) at the launch of the party's general election manifesto in Bristol PA 86/107 The PM tastes whisky during a visit to Diageo's Roseisle Distillery near Elgin, Scotland Reuters 87/107 Nigel Farage poses with boxer Dereck Chisora during a visit to a boxing gym in Ilford Reuters 88/107 Jo Swinson visits a science class at Hinchley Wood School near Esher Reuters 89/107 First Minister Nicola Sturgeon holds a guitar as she visits Dalkeith Community Hub Getty 90/107 A man heckles as Jeremy Corbyn gives a speech at the Senior Citizens Hall in Macclesfield Getty 91/107 Britain's opposition Labour Party leader Jeremy Corbyn visits residents affected by flooding in Conisbrough Reuters 92/107 Boris Johnson gestures as he helps quality control staff during a visit to the Tayto Castle crisp factory in County Armagh, Northern Ireland AFP via Getty 93/107 The Lib Dem leader eats a marshmallow during a visit to Free Rangers Nursery in Midsomer Norton, Somerset PA 94/107 Nigel Farage visits a butcher's shop in Sutton-in-Ashfield Reuters 95/107 SNP leader Nicola Sturgeon visits Blosson Tree children's nursery AFP via Getty 96/107 Jeremy Corbyn laughs during a visit to the Scrap Creative Reuse Arts Project, Sunny Bank Mills Getty 97/107 Prime Minister Boris Johnson hold Rosie the rabbit during a visit to a primary school while on the campaign trail in Taunton AFP via Getty 98/107 Jo Swinson playing with children at the Battersea Arts Centre in Lavender Hill PA 99/107 Farage addresses supporters at the Washington Central Hotel in Workington PA 100/107 Jeremy Corbyn poses with Labour activists as they canvas in Govan, Glasgow PA 101/107 Nicola Sturgeon during a visit to The Shed, a Climate Challenge community project at North Edinburgh Arts PA 102/107 Prime Minister Boris Johnson meets six month old Willow Rose Anderson, at the Lych Gate Tavern in Wolverhampton PA 103/107 Jo Swinson holds up a sack of barley during a visit to Crafty Maltsters Scotland Getty 104/107 Jeremy Corbyn tries a scone in Bentley, Doncaster PA 105/107 Nigel Farage takes a mouthful of homemade cheesecake during a stop at the Grimsby Seafood Village PA 106/107 Boris Johnson hauling a consignment of frozen chocolate gateaux, during a visit to Iceland Foods HQ in Deeside PA 107/107 Jo Swinson puts on a high visibility jacket during a visit to Sigma Pharmaceuticals, a family run pharmaceutical wholesaler in Watford AFP via Getty 1/107 Britain's Prime Minister Boris Johnson visits a Christmas market in Salisbury REUTERS 2/107 Liberal Democrat Leader Jo Swinson on the election campaign bus on route to Chelmsford PA 3/107 Labour leader Jeremy Corbyn talking to a university worker outside Birkbeck/SOAS University of London, at the announcement of his parties of the plan for the extension of workers' rights PA 4/107 Nicola Sturgeon plays a game with string during a visit to Perth and District YMCA Getty Images 5/107 Brexit Party leader Nigel Farage picks up a copy of The Brexiteer during a visit to JPI Printers in Dinnington PA 6/107 Boris Johnson, centre, talks to veteran James Gammer as he visits a veterans centre AP 7/107 SNP supporters meet First Minister Nicola Sturgeon following her address during a St Andrews day election speech Getty 8/107 Jeremy Corbyn has a photo taken outside Birkbeck/SOAS University PA 9/107 Liberal Democrat leader Jo Swinson during a visit to the Cardiff United Synagogue PA 10/107 Brexit Party leader Nigel Farage reacts as he attends an election debate ITV/Reuters 11/107 Jeremy Corbyn wears a jacked displaying Labour's slogan 'For the many, not the few' EPA 12/107 Prime Minister Boris Johnson on The Andrew Marr Show Getty 13/107 Nicola Sturgeon plays with local children during a visit to the Jelly Tots & Cookies Play Cafe in Uddingston, South Lanarkshire PA 14/107 Opposition Labour Party leader Jeremy Corbyn eats some chips in Whitby, northern England AFP via Getty 15/107 Boris Johnson and Conservative MP George Eustice, left, tour 'Rodda's Clotted Cream' whilst campaigning in Cornwall Getty 16/107 Jo Swinson during a visit to Dunkertons Cider Company, an organic and plastic free brewery in Cheltenham PA 17/107 Jeremy Corbyn holds up unreacted documents with NHS staff. Mr Corbyn released uncensored official documents which he says provides confirmation that the NHS is on the table in trade talks with the USA EPA 18/107 Nigel Farage meets locals in Barnsley market PA 19/107 Nicola Sturgeon launches the SNP's general election manifesto Getty 20/107 Labour Party leader Jeremy Corbyn addresses the audience during the launch of Labour's environmental policy in Southampton Getty 21/107 Boris Johnson tries an apple as he visits Healey's Cornish Cyder Farm in Callestick AP 22/107 Jo Swinson helps make a chicken tikka masala during a visit to the Ashoka restaurant in Bearsden, Glasgow PA 23/107 Nigel Farage playing golf on a range at One Stop Golf in Hull PA 24/107 Jeremy Corbyn addresses the audience during a climate emergency rally in Falmouth Getty 25/107 Liberal Democrat leader Jo Swinson meets supporters during a visit to Dunkertons Cider Company PA 26/107 Boris Johnson visits Chulmleigh College AP 27/107 Labour Party leader Jeremy Corbyn as he appearing on the BBC political programme The Andrew Neil Show. The opposition leader defended his handling of anti-Semitism allegations after Britain's most senior rabbi suggested the issue was a "new poison" within the party that had been "sanctioned from the very top". In an unprecedented intervention ahead of next month's election, Chief Rabbi Ephraim Mirvis suggested Corbyn was "unfit for high office" due to his perceived failure to clamp down on the problem within the party BBC/AFP via Getty 28/107 PA 29/107 Prime Minister Boris Johnson launches the Conservative Party Scottish Manifesto in North Queensferry Getty 30/107 Britain's Opposition leader Jeremy Corbyn poses with WASPI (Women Against State Pension Inequality) supporters after he outlined Labour's plans to repay the "historical debt of honour" owed to women born in the 1950's AFP via Getty 31/107 Jo Swinson alongside the Lib Dem's candidate for Truro and Falmouth, Ruth Gripper, and founder of Finisterre, Tom Kay, during a tour of the British surfing brand, which creates sustainable surfing gear, in St Agnes, Cornwall PA 32/107 Prime Minister Boris Johnson poses with sheep as he visits the Royal Welsh Showground, in Llanelwedd PA 33/107 A coalition of NHS (National Health Service) campaigners led by "Keep Our NHS Public" and "We Own It", pose for photographs with masks of US President Donal Trump, right, and Prime Minister Boris Johnson carving up the NHS with a giant knife and fork, as they take part in a demonstration on Parliament Square. The campaigners are calling for the NHS to be taken "off the table" in a trade deal with the US by ending privatisation in the health service and restoring it to a wholly publicly owned and provided service AP 34/107 Brexit Party leader Nigel Farage visits Plymouth Fisheries at Sutton Harbour Getty 35/107 SNP leader Nicola Sturgeon gives her party's candidate for North East Fife Stephen Gethins a haircut, during a visit to Craig Boyd Hairdressing in Leven PA 36/107 Vans belonging to The Community United against Labour Party anti-Semitism group, Culpa, parked next to a police car ahead of the Labour Race and Faith Manifesto launch Getty 37/107 Boris Johnson prepares to serve food at the Royal Welsh Showground PA 38/107 Jeremy Corbyn tries his hand at bricklaying during a visit to the West Nottinghamshire College Construction Centre, in Ashfield PA 39/107 Liberal Democrat leader Jo Swinson during a visit to the London design museum to discuss the party's tech policy PA 40/107 Brexit Party leader Nigel Farage visits Seaham Getty 41/107 Britain's Prime Minister Boris Johnson arrives for the Conservative party's manifesto launch in Telford Reuters 42/107 Labour Party leader Jeremy Corbyn meets supporters during a visit to Thurrock in Essex PA 43/107 Protesters wait for the arrival of Prime Minister Boris Johnson ahead of the launch of his party's manifesto PA 44/107 Jo Swinson gestures from atop a crane during a visit to an eco home building site in Sheffield AFP via Getty 45/107 Jeremy Corbyn meets a supporter on a train on his return from a visit to Sheffield PA 46/107 Prime Minister Boris Johnson during a visit to Bassetlaw District General Hospital in Worksop, Nottinghamshire PA 47/107 Nigel Farage campaigns in Hartlepool Getty Images 48/107 Jeremy Corbyn outside an Amazon depot in Sheffield, to announce plans for a workers' rights revolution and to ensure big businesses pay their fair share of taxes PA 49/107 Prime Minister Boris Johnson, Liberal Democrat leader Jo Swinson, First Minister of Scotland Nicola Sturgeon and Labour leader Jeremy Corbyn, during their successive appearances on BBC Question Time Leaders' Special at the Octagon in Sheffield PA 50/107 Liberal Democratic Party leader Jo Swinson visits a primary school in Cambridge EPA 51/107 Boris Johnson lays a brick during a visit to the Barratt Homes Getty 52/107 Labour leader Jeremy Corbyn attends the launch of the party's election manifesto at Birmingham City University Getty 53/107 Brexit Party leader Nigel Farage holds his party policy document during the party's policy launch in Westminster PA 54/107 SNP leader Nicola Sturgeon joined Dundee East candidate Stewart Hosie to made a keynote speech at The Quay Getty 55/107 Prime Minister Boris Johnson holds a part of an electrical appliance during a General Election campaign trail stop at Ebac in Newton Aycliffe AP 56/107 Jeremy Corbyn poses during a visit to The Oatcake Boat on the Trent & Mersey Canal, Stoke Getty 57/107 Jo Swinson and Willie Rennie Leader of the Scottish Liberal Democrats gesture, during a visit to Glasgow Reuters 58/107 PA 59/107 Liberal Democrat leader Jo Swinson (left) during a visit to the Gurdwara Singh Sabha Temple in Glasgow PA 60/107 Labour leader Jeremy Corbyn meets Colin and his mother after a speech at the University of Lancaster Getty Images 61/107 Britain's Green Party co-leaders Jonathan Bartley, Sian Berry, and deputy leader Amelia Womack, wave during the launch of the party manifesto at the Observatory at London Wetland Centre Reuters 62/107 Scottish Nationalist Party leader Nicola Sturgeon meets voters and activists at Cafe Roma in Clarkston, Glasgow AFP via Getty 63/107 Protestors participate in an anti-Boris Johnson rally in his constituency Uxbridge, west London AFP via Getty Images 64/107 Brexit Party leader Nigel Farage looks out from a window on the Kestrel crabbing boat in Grimsby fish dock PA 65/107 Prime Minister Boris Johnson on a tug boat in the port of Bristol PA 66/107 Green Party Co-Leader Sian Berry has a selfie taken with a supporter at the Observatory, London Wetlands Centre PA 67/107 Jo Swinson helps chef Leonardo Mastofilippo to make pizza during a campaign visit to cafe Amisha in South Bermonsey EPA 68/107 Labour leader Jeremy Corbyn with WASPI (Women Against State Pension Inequality) ladies during a visit to Birkenshaw Sports Barn in Uddingston EPA 69/107 Boris Johnson at the unveiling of the Conservative Party battlebus in Middleton, Greater Manchester PA 70/107 Nicola Sturgeon sits alongside Cycling Without Age user Cyril Corcoran (centre), aged 78, in an electric tricycle during a visit to Hawick, in the Scottish Borders PA 71/107 Nigel Farage holds a fish during a stop at the Grimsby Seafood Village PA 72/107 Liberal Democrats leader Jo Swinson in the boxing ring at Total Boxer, a specialised boxing gym which offers training to young people as a means of keeping them away from violence, in Crouch End, London PA 73/107 Britain's Prime Minister Boris Johnson reacts as he participates in a school art lesson, making a clay figure at George Spencer Academy, west of Nottingham AFP via Getty 74/107 Labour Party leader Jeremy Corbyn during a visit to the Heart of Scotstoun Community Centre in Glasgow PA 75/107 Scotland's First Minister and SNP leader Nicola Sturgeon visits the Cafe Gelato in Rutherglen, Glasgow EPA 76/107 The Green Party launch in Bristol PA 77/107 Farage enjoys some chips at the start of a nationwide tour for the 2019 general election, in Whitehaven AFP/Getty 78/107 Labour leader Jeremy Corbyn unveils the Labour battle bus in Liverpool PA 79/107 Boris Johnson reacts as he talks with workers whilst weighing packaged tea bags at the Tetley Tea Factory in Stockton-on-Tees AFP/Getty 80/107 Brexit Party leader Nigel Farage on the campaign trail in Whitehaven, where he was confronted by Karl Connor PA 81/107 Lib Dem leader Jo Swinson speaks to volunteer Rosie Squires in the Stainforth 4 All charity shop during a visit to Stainforth in South Yorkshire to meet people affected by flooding PA 82/107 Nicola Sturgeon poses with candidates during the SNP general election campaign launch in Edinburgh Reuters 83/107 Labour Party leader Jeremy Corbyn with Laura McAlpine, the party's candidate for Harlow PA 84/107 Anti-Boris Johnson protesters demonstrate outside the hall where the Conservative Party were launching their campaign in Birmingham EPA 85/107 Green Party Co-Leader Sian Berry (left), Deputy Leader and Parliamentary Candidate for Newport West Amelia Womack (right), and Bristol West Candidate Carla Denyer (centre) at the launch of the party's general election manifesto in Bristol PA 86/107 The PM tastes whisky during a visit to Diageo's Roseisle Distillery near Elgin, Scotland Reuters 87/107 Nigel Farage poses with boxer Dereck Chisora during a visit to a boxing gym in Ilford Reuters 88/107 Jo Swinson visits a science class at Hinchley Wood School near Esher Reuters 89/107 First Minister Nicola Sturgeon holds a guitar as she visits Dalkeith Community Hub Getty 90/107 A man heckles as Jeremy Corbyn gives a speech at the Senior Citizens Hall in Macclesfield Getty 91/107 Britain's opposition Labour Party leader Jeremy Corbyn visits residents affected by flooding in Conisbrough Reuters 92/107 Boris Johnson gestures as he helps quality control staff during a visit to the Tayto Castle crisp factory in County Armagh, Northern Ireland AFP via Getty 93/107 The Lib Dem leader eats a marshmallow during a visit to Free Rangers Nursery in Midsomer Norton, Somerset PA 94/107 Nigel Farage visits a butcher's shop in Sutton-in-Ashfield Reuters 95/107 SNP leader Nicola Sturgeon visits Blosson Tree children's nursery AFP via Getty 96/107 Jeremy Corbyn laughs during a visit to the Scrap Creative Reuse Arts Project, Sunny Bank Mills Getty 97/107 Prime Minister Boris Johnson hold Rosie the rabbit during a visit to a primary school while on the campaign trail in Taunton AFP via Getty 98/107 Jo Swinson playing with children at the Battersea Arts Centre in Lavender Hill PA 99/107 Farage addresses supporters at the Washington Central Hotel in Workington PA 100/107 Jeremy Corbyn poses with Labour activists as they canvas in Govan, Glasgow PA 101/107 Nicola Sturgeon during a visit to The Shed, a Climate Challenge community project at North Edinburgh Arts PA 102/107 Prime Minister Boris Johnson meets six month old Willow Rose Anderson, at the Lych Gate Tavern in Wolverhampton PA 103/107 Jo Swinson holds up a sack of barley during a visit to Crafty Maltsters Scotland Getty 104/107 Jeremy Corbyn tries a scone in Bentley, Doncaster PA 105/107 Nigel Farage takes a mouthful of homemade cheesecake during a stop at the Grimsby Seafood Village PA 106/107 Boris Johnson hauling a consignment of frozen chocolate gateaux, during a visit to Iceland Foods HQ in Deeside PA 107/107 Jo Swinson puts on a high visibility jacket during a visit to Sigma Pharmaceuticals, a family run pharmaceutical wholesaler in Watford AFP via Getty

The leaked document, entitled “NI Protocol: Unfettered access to the UK internal market”, appears to be an official analysis of the Northern Ireland protocol, which replaces the Irish border backstop negotiated by Theresa May.

The Labour leader said the confidential report “drives a coach and horses” through Mr Johnson’s promise to the DUP that there will be no border in the Irish Sea under his Brexit plan.

The paper, which has been seen by The Independent, reveals there would be customs declarations and regulatory checks on goods travelling between Northern Ireland and Britain – which Mr Johnson has repeatedly denied.

Checks could be “highly disruptive” to the Northern Ireland economy, where 98 per cent of exporters to Britain are small businesses who will be hit hard by these extra costs, according to the report.

Prices of imported high street goods are likely to rise, which would hit business profits and the retail sector, it added.

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Mr Corbyn said: “It is there in black and white. It says there will be customs declarations, absolutely clearly, for trade going from Northern Ireland to Great Britain.

“The government cannot rule out regulatory checks, rules of origin checks and animal and public health checks also. For trade going the other way, from Great Britain to Northern Ireland, there will be all of the above plus potentially damaging tariffs.”

The leaked document seems to confirm in the government’s own words what essentially all trade experts say about the Brexit deal with regard to customs, but which Mr Johnson has continued to deny point-blank when asked in public.

At the start of the election campaign, the prime minister was asked in person by Northern Ireland business leaders whether they would be subject to customs declarations.

“You will absolutely not,” he told them. “If anyone asks you to do that tell them to ring up the prime minister and I’ll direct them to put that form in the bin.”

However, Steve Barclay, the Brexit secretary, and Julian Smith, the Northern Ireland secretary, have both previously said that some checks will be necessary on goods travelling across the Irish Sea.

Mr Johnson was challenged over the disparity between the document and his previous claims during a campaign visit in southern England, where a journalist asked him: “Either you don’t know the detail of your policy or you are lying. Which is it?”

He replied: “I know perfectly well that goods going from NI to GB and GB to NI will have no checks. The only checks will be those going via NI into Ireland. Everybody understands that and that’s so we avoid a hard border between Ireland and Northern Ireland.”

Asked what voters should believe, the prime minister said: “They should believe exactly what I say, which is that there will be no checks on goods going from GB to NI or NI to GB, because we are going to come out of the EU whole and entire.

“That’s the objective we secured, which is a vast improvement on the original proposal, which would indeed have carved out Northern Ireland and kept it in the EU for all sorts of purposes.”

Earlier in the campaign, Labour presented separate leaked documents that showed UK negotiators have been repeatedly discussing the NHS with US trade officials, despite claims by Mr Johnson that the NHS is not “on the table” in talks.

A Treasury spokesman said: “We don’t comment on leaked documents.”