Labour has descended into a row with MPs branding their own colleagues “cowards” while warning they would “never be forgiven” if they backed Theresa May’s Brexit deal.

The row erupted after an MP signalled he could accept funding to regenerate his constituency in return for backing the prime minister’s deal in the Commons.

One colleague said it would be a betrayal as bad as first Labour leader Ramsay Macdonald’s decision to form a government with opposition MPs.

It comes after 14 MPs defied the Labour whip and refused to back a plan to delay Brexit, brought forward by ex-Labour minister Yvette Cooper, while seven backed the move to mandate Ms May to go back to Brussels and renegotiate her deal.

A handful of the party’s frontbenchers also failed to vote with the whip by abstaining, underlining the increasing difficulty of maintaining unity behind Mr Corbyn’s nuanced line on Brexit.

Downing Street denied that the government was offering “cash for votes” to Labour MPs from Leave-voting constituencies, but it did hint at additional financial support for former mining communities.

Labour’s Brexit-backing Bassetlaw MP John Mann, tweeted: “Show us the money.

“A fund of sufficient size to transform our communities. Our areas voted Leave and it is time that we had the investment we need.

How Brexit will affect your travel to Europe Show all 14 1 /14 How Brexit will affect your travel to Europe How Brexit will affect your travel to Europe Passports British passports that expire after 29 March 2019 will continue to be valid as UK travel documents, but will lose the power that comes with being a European Union passport – notably the right of free movement within the EU27. UK passports issued from 30 March 2019 will have the words “European Union” removed from the cover and the first page (along with the translations into Welsh and Gaelic). But they will still be burgundy. By October 2019, new British passports will have dark blue covers Getty How Brexit will affect your travel to Europe Pets You will still be able to travel to the EU with your pet after Brexit, but it could well get more complicated depending on the status that the European Union decide to apply. If the UK is given “Part 2 listed status”, there would be some extra requirements for travelling pets and owners post-Brexit. “These would require an additional visit to the vet and some additional papers to be carried but would not prevent you from enjoying your trip,” says Eurotunnel. But it adds that if the UK is given unlisted, third-country status, “owners who wish to travel with their pets from the UK to EU nations will need to discuss their specific preparations and requirements with an Official Veterinarian at least four months prior to their desired travel date AFP/Getty How Brexit will affect your travel to Europe Eurotunnel/Eurostar The Treaty of Canterbury between the UK and France governs the Channel Tunnel link and operations will continue – subject to any local disruption at Folkestone and/or Calais AFP/Getty How Brexit will affect your travel to Europe Driving Motorists, whether taking their own cars or hiring abroad, are likely to need to obtain an International Driving Permit or two; different EU countries are signed up to different treaties, so for a trip embracing Spain and France you would need both types. These are currently sold from a limited number of Post Offices, but the government intends to make them widely available. The cost is £5.50 for each. Motor insurance will no longer automatically extend to the EU. Insurers will provide on request a “Green Card”, for which an extra charge will be made PA How Brexit will affect your travel to Europe Flights Even in the event of a no-deal Brexit, flights will continue to operate between the UK and European Union. However, in the event of the UK leaving with no deal, many flights are likely to be cancelled because departures would be capped at 2018 levels. As UK airlines have already announced thousands of new flights to Europe from the end of March 2019, some would have to be cancelled Getty How Brexit will affect your travel to Europe Air routes The network of flight links between Britain and eastern Europe could be affected by any reduction in the number of workers from those countries. Not only do they use the flights – so do their families and friends PA How Brexit will affect your travel to Europe Flight disruption rights Current European passengers’ rights rules, known as EC261/2004, stipulate high payouts for delays and cancellations that cannot be attributed to “extraordinary circumstances”. Buried in a document called Beyond the Horizon: The Future of UK Aviation, the government says “the UK will not fall below current standards of protection when we leave the EU” AFP/Getty How Brexit will affect your travel to Europe Entry regulations to the European Union From 11pm GMT on 29 March 2019, UK travellers will become “third-country nationals” when travelling to Schengen countries and subject to the standard rules of admission for citizens of nations such as the US, Japan and Australia. That means there must be at least 90 days (roughly three months) left on your passport beyond your intended date of departure. Because third-country nationals can remain in the Schengen area for 90 days, the actual check carried out could be that the passport has at least six months’ validity remaining on the date of arrival Getty How Brexit will affect your travel to Europe Online registration prior to travel – ETIAS From 2021, non-EU nationals who do not require a visa to enter the Schengen area – including British travellers – will need to request prior authorisation to visit Schengen countries. The Travel Information and Authorisation System (ETIAS) is aimed at reducing the “migration, security or public-health risk” from nationals of visa-exempt third countries, which is what the UK will become after Brexit. It costs €7 for three years AFP/Getty How Brexit will affect your travel to Europe ‘Brexit clauses’ A large number of travel providers – even including National Express coaches – have added “Brexit clauses” to their terms and conditions. These generally specify that they will not be liable for “consequential losses” as a result of Brexit-related issues PA How Brexit will affect your travel to Europe ‘Fast track’ lanes for passport control entering EU countries British passport holders will not be able to use them, and must join the queue for third-country nationals. People holding an EU passport or ID card as well as a British passport will be able to exit the UK on the British passport but enter Europe on the EU document Getty How Brexit will affect your travel to Europe Ferries The ferry industry insists vessels will continue to sail. The UK Chamber of Shipping says: “Unlike the carriage of cargo, trade deals do not have a significant effect on the cruise and passenger ferry industry. The explicit standardisation of commodity codes and tariffs associated with trade deals have little relevance to holidaymakers.” Having said that, the government and Kent County Council are planning for possible chaos at Channel ports because of a backlog of trucks in the event of a no-deal Brexit. This would impinge on holidaymakers’ plans PA How Brexit will affect your travel to Europe European Health Insurance Card (EHIC) The EU says: “If you fall ill or have an accident during a visit to another EU country, as an EU citizen you have the right to receive the necessary public healthcare in any EU country under the same conditions as people in the host country.” The EHIC also works in Iceland, Norway, Switzerland and Liechtenstein. Treatment, says the NHS, is “at a reduced cost or, in many cases, free of charge”. From 11pm GMT on 29 March 2019, when the UK ceases to belong to the European Union, British travellers will have no automatic right to use the EHIC. There is no certainty about what may replace it PA How Brexit will affect your travel to Europe Mobile phones From 30 March 2019, the law banning mobile phone firms from charging extra for calls and data in Europe will cease, though operators have yet to set out exactly what will replace it. In theory, mobile phone firms can impose whatever fees they think the market will bear. But Dave Dyson, chef executive of Three, says his firm is “committed to maintain the availability of roaming in the EU at no additional cost following Brexit” AFP/Getty

“Our areas need to see a fund established that is transformative. The forgotten areas of Britain who voted Leave want jobs, rights and investment.”

But in a furious backlash, London MP David Lammy said of anyone thinking of doing a deal: “More fool them. Socialists, my arse. Cowards and facilitators. History will be brutal.”

Show us the money. A fund of sufficient size to transform our communities. Our areas voted Leave and it is time that we had the investment we need Labour MP John Mann

The MP later compared them to servants in the ITV costume drama Downton Abbey, accepting a gift from the master of the house.

Another London MP, Wes Streeting, said the government’s promise of funding is “not worth the newsprint it is printed on”, claiming the real Conservative agenda was to “slash workers’ rights, to weaken trade unions and to open up our public services to untrammelled market forces”.

He added: “For Labour MPs to align themselves with the likes of Boris Johnson, Iain Duncan Smith and Priti Patel on Brexit would be a mistake that would rank alongside Ramsay MacDonald’s 1931 creation of a national government.

“It would never be forgiven and never be forgivable.”

Jeremy Hunt admits the government may need 'extra time' if a Brexit deal is agreed

Other Labour MPs from constituencies in the north, who also voted against the plan to delay Brexit, also weighed in.

Wigan MP Lisa Nandy said: “Nobody from government has approached me about this, but if they did I would tell them there’s no point investing in towns if they’re taking us down a route that destroys jobs, wages and workers’ rights.

“A permanent customs union and commitment to workers’ rights remains the issue.”

And Wirral South MP Alison McGovern, who backs a fresh referendum, said: “The fact is, it will be a lot easier to invest in the coalfield areas and other towns if we stay in the EU.”

It follows the spat between Labour MPs earlier in the week following the result of Tuesday’s votes on Brexit.

MPs vote on Brexit plans: Which amendments passed

Pro-EU MPs said they were disappointed colleagues had not backed the play to delay Brexit in enough numbers to make it pass, while Graham Stringer MP, one of those who refused to back, compared colleagues trying to push it through to “kindergarten” children.

Asked on Thursday whether there would be sanctions against Labour MPs who did not vote for Yvette Cooper’s amendment, Mr Corbyn said: “I was very disappointed because we came to the view that we would support Yvette Cooper’s proposals.

“I discussed them with her and she agreed with me to reduce the time on it to a maximum of three months because it was rather open-ended before that.

“On that basis, I recommended that all Labour MPs should support it. Sadly, a small number decided not to and we will be dealing with that issue.”

Pushed on how he would be “dealing with it”, the Labour leader said: “We will be speaking to them and sanctions may or may not apply after those discussions. But I would also say that at the Labour Party conference last year we came to a unanimous view on the Labour proposals which are the three pillars – customs union, access to the market and protection of rights.