LABOUR have said they back a public vote on any Brexit deal – whether or not terms are successfully negotiated with the EU – but have admitted they may have to one day campaign against their own deal.

The astonishing admission comes after the party spent the previous few years avoiding firm, collective stance on Brexit.

Labour trade union leaders, which included Unite’s Len McCluskey (pictured left), yesterday reached agreement with leader Jeremy Corbyn, backing a referendum on any future Tory deal or in the even of a no-deal exit. However, the party also agreed that if it were to win a snap General Election and find itself negotiating with the EU, any deal would be subject to a “confirmatory vote”.

Curiously, Labour’s position in a second referendum campaign would then “depend upon the deal negotiated”, meaning the nation could be faced with the bizarre situation in which the UK Government is campaigning against the very deal it has negotiated.

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Corbyn’s deputy Tom Watson called the move “a step in the right direction” but called on the party to go further and declare their support for Remain. “Remain is who we are,” he tweeted. “Our values are remain, our hearts are remain.”

One senior shadow cabinet source told The Guardian the move was a significant victory for the Remain-supporting element within Labour, despite the failure of the party to fully clarify their position.

“Unions have backed a referendum on any deal this parliament and Labour campaigning for remain – that’s a big victory,” the source said.

“What’s in a manifesto is a debate for another day.”