Labour MPs have urged Jeremy Corbyn to “get off the fence” and back calls for Britain to stay in the European single market and customs union after Brexit.

Figures from the Labour Campaign for the Single Market (LCSM) group called on their party leader to change tack amid “real frustration” among Labour members and supporters over the party’s Brexit stance.

Mr Corbyn has attempted to tread a difficult path between the views of his MPs and party members, who are overwhelmingly pro-Europe, and Eurosceptic Labour voters in many of his party’s Leave-backing constituencies.

However, he has come under renewed pressure from backbenchers voicing concern that the party is supporting Conservative plans for a hard Brexit. A significant number of Labour MPs are expected to voice dissent and rebel in key votes when the EU Withdrawal Bill returns to the House of Commons later this year.

Labour’s current position is that Britain should leave the single market and customs union but retain as much access as possible to both. Mr Corbyn has also suggested the UK could form a new customs union with the EU after Brexit.

Many of his MPs and party members, however, want him to commit to keeping Britain in the existing single market and customs union.

Heidi Alexander MP, co-chair of LCSM, said: "We have to be honest. There is real frustration out there amongst Labour members and supporters about the party's position on Brexit.

"The sooner the leadership recognise this, the better it will be for the country. At no point in my lifetime has the opposition's policy on an issue been more important.

"The fact that we continue to hedge our bets, when the argument is there to be won, is not doing anyone any favours.

"We need to remain in the customs union, meaning no tariffs on goods traded between the UK and the EU, and we need to stay in the single market, so our service industries can continue to trade freely and easily.

"If we don't get our act together we will see jobs go, the tax-take fall and public services cut further - we can't let that happen."

Brexit so far: in pictures Show all 53 1 /53 Brexit so far: in pictures Brexit so far: in pictures Brexit campaign Boris Johnson led the VoteLeave campaign PA Brexit so far: in pictures Brexit campaign Boris Johnson MP, Labour MP Gisela Stuart and UKIP MP Douglas Carswell address the people of Stafford in Market Square during the Vote Leave Brexit Battle Bus tour on 17 May 2016. Their lead line on the tour was: “We send the EU £350 million a week, let's fund our NHS instead.” Getty Brexit so far: in pictures Voting day A man shelters from the rain as he arrives at a polling station in London on 23 June 2016. Millions of Britons voted in the referendum on whether to stay in or leave the European Union AFP/Getty Brexit so far: in pictures Referendum results Leader of Ukip, Nigel Farage, reacts at the Leave EU referendum party at Millbank Tower in central London as results indicated that it was likely the UK would leave the European Union AFP/Getty Brexit so far: in pictures Protesting the result A young couple painted as EU flags and a man with a sign reading “I’m not leaving” protest outside Downing Street against the voters decision to leave the EU on 24 June 2016 Getty Brexit so far: in pictures David Cameron resigns British Prime Minister David Cameron resigns on the steps of 10 Downing Street on 24 June 2016 after the results of the EU referendum were declared and the United Kingdom voted to leave the European Union Getty Brexit so far: in pictures Theresa May Becomes the new Conservative Party leader Theresa May receives a kiss from her husband Philip, after becoming the new Conservative Party leader on 11 July 2016. 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British Prime Minister Theresa May faced pressure to resign on 9 June 2017 after losing her parliamentary majority, plunging the country into uncertainty as Brexit talks loomed. 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May and Macron agreed a new border security deal, through which the UK will pay more to France to stop migrants trying to reach British shores on 18 January 2018 AFP/Getty Brexit so far: in pictures Transition period agreed The UK and EU agree terms for Brexit transition period on 19 March, 2018 Reuters Brexit so far: in pictures No agreement on Irish border The EU and UK however failed to reach an agreement on the Irish border during the successful talks on other Brexit issues AFP/Getty Brexit so far: in pictures EU attacks May’s ‘fantasy’ strategy For months after the March deal is struck there is little significant progress in talks. 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She asserts this amongst continued attacks on her approach to Brexit by Boris Johnson and the European Research Group, headed by Jacob Rees Mogg BBC/Jeff Overs Brexit so far: in pictures EU leaders reject Chequers Quite the blow was dealt to the Prime Minister at a EU leaders summit in Salzburg on September 20. European Council President Donald Tusk stated that the Chequers deal "will not work" Reuters Brexit so far: in pictures May demands respect Following the rejection of her Chequers plan the day before, the Prime Minister voiced her anger that the EU had dismissed it without offering an alternative. She stated that “throughout this process, I have treated the EU with nothing but respect. The UK expects the same. A good relationship at the end of this process depends on it." Getty Brexit so far: in pictures People's Vote march As the People's Vote campaign and The Independent's Final Say campaign gain traction, 700,000 people turn out in London to demand a final say on the UK's Brexit deal on October 20 2018 PA Brexit so far: in pictures More resignations As the Prime Minister settles on a Brexit deal, Brexit secretary Dominic Raab resigns along with Work and Pensions secretary Esther McVey and many other ministers Getty Brexit so far: in pictures Final Say petitions delivered to Downing Street People's Vote supporting MPs Chukka Umunna, Justine Greening and Caroline Lucas and The Independent editor Christian Broughton deliver over a million signatures in favour of a People's Vote to the Prime Minister at 10 Downing Street on December 3 2018 PA Brexit so far: in pictures May delays vote On December 10, the Prime Minister delayed the vote on her Brexit deal as it was near certain not to pass through the Commons due to Tory rebels and lack of DUP support AFP/Getty Brexit so far: in pictures No confidence motion Tory MPs triggered a confidence vote in the Prime Minister on December 12. She won by 200 votes to 117 Reuters Brexit so far: in pictures Commons rejects the deal Following the delay, the Prime Minister's deal was rejected in the Commons by a historic 230 votes AFP Brexit so far: in pictures Corbyn tables a no confidence motion Following the rejection of the Prime Minister's deal, opposition leader Jeremy Corbyn tabled a motion of no confidence in the government, which the government won by a margin of 19 AFP/Getty Brexit so far: in pictures Plan B The Prime Minister won the support of the commons to return to Brussels to renegotiate the backstop on January 29. In the same sitting, MPs also voted against a no-deal Brexit in a non-legally binding motion PA Brexit so far: in pictures EU council president savages Brexit campaigners who failed to plan for departure: ‘Special place in hell’ There is a “special place in hell” for pro-Brexit campaigners who demanded Britain leave the EU without explaining how it should happen, Donald Tusk has said. 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In a joint statement the British government and European Commission said Ms May had had a “robust but constructive” meeting with president Jean-Claude Juncker, and that the pair would meet again before the end of the month. But the EU again refused to reopen the withdrawal agreement and its controversial backstop – with any negotiations expected to focus on the future relationship between the UK and EU instead Getty Brexit so far: in pictures Brexit strategy lost MPs voted down May's Brext plans, with a majority of 45. The prime minister did not appear in parliament to see another defeat PA Brexit so far: in pictures Labour and Conservative MPs resign and create the Independent Group Back row of Chris Leslie, Gavin Shuker, Chuka Umunna and Mike Gapes, middle row of Angela Smith, Luciana Berger and Ann Coffey and front row of Sarah Wollaston, Heidi Allen, Anna Soubry and Joan Ryan PA Brexit so far: in pictures Non-biding votes on amendments to Brexit motion On February 27 he house held a series of votes, unanimously calling for the UK and EU to guarantee citizens rights in a no-deal scenario AFP/Getty Brexit so far: in pictures Attorney General publishes legal advice A hammer blow for May as Geoffrey Cox said her renegotiated deal can still leave UK in backstop against its will. Mr Cox did say the prime minister’s efforts had reduced the risk of the UK being trapped in the backstop indefinitely. MPs went on to vote against her deal by 391 to 242 UK Parliament/PA Brexit so far: in pictures No-deal off the table MPs rejected a no-deal Brexit by 43 votes on March 13, with cabinet ministers rebelling in another humiliating defeat for Theresa May. A day later they voted in favour of the prime minister seeking an extension to Article 50 AFP/Getty Brexit so far: in pictures House speaker bans May from third Commons vote on same Brexit deal John Bercow sensationally told Theresa May he would stop her making another attempt to pass her Brexit deal unless she has secured changes. The Speaker said a further ‘meaningful vote’ would be ruled out of order if the motion was “the same or substantially the same’ – under an ancient convention to stop the government bullying parliament on issues MPs have rejected Parliament Live Brexit so far: in pictures May writes to Tusk The prime minister wrote to Donald Tusk, president of the European Council, to ask for a three-month extension to give her more time to try to get her deal through parliament. However the European Commission advises the EU27 should offer a short extension to May 23 or a longer one meaning the UK would participate in European elections 10 Downing Street/AFP/Getty Brexit so far: in pictures European Council summit Theresa May’s request to extend triggering Article 50 until the end of June was rejected by the EU, and instead offered a shorter time frame. She accepted the offer of a delay until May 22 if her withdrawal deal is approved by Parliament. If MPs rejected it for a third time, the EU said Britain must propose a new plan by April 12. Ms May said she will not support a long delay because it would mean Britain participating in elections for the European Parliament Getty Brexit so far: in pictures Brussels confirms preparations for a no-deal Brexit are completed They warned that it is “increasingly likely” the UK will crash out. In a statement the European Commission (EC) said “preparedness and contingency work”, which the EC has been conducting since December 2017, was now finished. The announcement came days after EU leaders agreed to a request by Theresa May to extend the UK’s Brexit date AFP Brexit so far: in pictures May resigns British Prime Minister Theresa May reacts as she delivers a statement in London, Britain, May 24, 2019. REUTERS/Simon Dawson SIMON DAWSON Reuters

Her co-chair, Alison McGovern MP, said: "It is time for Labour to get off the fence.

"To end any perception that our party is on the same side as the purveyors of falsehoods like Boris Johnson and Michael Gove we need there to be a real difference between our party's policy and that of Theresa May.

"Words about a 'jobs-first Brexit' are in danger of looking like nothing more than clever rhetoric unless Labour actually backs the policies that will put jobs first by keeping us in the single market and customs union."

LCSM accused Brexiteers in the Labour Party of perpetuating “mistruths”.

The organisation has joined with pro-Europe campaign group Open Britain to publish a pamphlet debunking some of these “myths”, including the claim that EU rules would prevent a future Labour government renationalising the railways, promoting a more active industrial strategy and negotiating more progressive trade deals.

The document also dismisses the idea that austerity is a consequence of EU membership.