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Len McCluskey has blasted Theresa May for "two wasted years" after she met him for historic union talks at 10 Downing Street.

The Unite boss made his first trip to No10 under Mrs May's leadership as she made a pitch to safeguard workers' rights after Brexit .

Trades Union Congress chief Frances O'Grady, Unison general secretary Dave Prentis and Tim Roache of the GMB also had one-on-one talks.

But as he exited the famous black front door, Mr McCluskey warned the talks could be a "PR stunt" - and urged the Prime Minister to delay Brexit to prevent a "disastrous" No Deal.

"What I was saying to the PM was look, is this just a PR stunt for the media, for you to say you've consulted with trade union officials?" he said.

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"Or is this a genuine attempt to see if we can talk about issues that matter to us?"

He added: "It's probably two and a half years too late. I wish we'd been involved in the discussions way back then."

Britain's biggest union boss rebuffed calls from cross-party MPs for Labour to swing behind a second EU referendum.

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Instead he said the date of Brexit should be delayed, for around three months, if proper further negotiations can be held.

He also backed Jeremy Corbyn's decision not to attend talks with Mrs May about the way forward.

And he urged MPs to back an amendment by Labour, due for a vote on Tuesday, which would spell out several options for what to do next.

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"We've been placed in this current mess, I think two years has been wasted with the PM having to argue with her own party," he said.

"Now we're in this dire position and Labour have put down an amendment that gets us out of it."

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Speaking earlier, TUC general secretary Frances O'Grady warned she had not received the guarantees unions are seeking on jobs and workers' rights.

And she repeated her call for Theresa May to take a no-deal Brexit off the table as she emerged from Downing Street.

(Image: AFP/Getty Images)

GMB General Secretary Tim Roache said: "I’m afraid to say the Prime Minister today failed to give us the guarantees we need over protecting jobs and rights at work.

“The concerns from members and their employers are mounting by the day as the clock runs down, and yet the Prime Minister is still refusing to take her threat of no deal off the table.

“We can’t carry on like this. As this crisis worsens, pretending nothing has changed is simply not good enough."

The Prime Minister was meeting union bosses just as one of Britain's largest manufacturers, Airbus, issued a stark warning of the potential damage to jobs from a no-deal departure.

The aerospace giant's chief executive, Tom Enders, branded the Government's handling of EU withdrawal a "disgrace" and warned the company could pull out of the UK if Brexit undermines its ability to compete.

(Image: Dan Kitwood)

Chancellor Philip Hammond was preparing to tell leaders at the World Economic Forum in Davos that post-Brexit Britain will still be a "great place to do business".

But Mr Enders said the UK's multi-billion pound aerospace sector was "standing at a precipice".

"Brexit is threatening to destroy a century of development based on education, research and human capital," he said.

(Image: Dan Kitwood)

"If there's a no-deal Brexit, we at Airbus will have to make potentially very harmful decisions for the UK."

Speaking after talks in Downing Street, Ms O'Grady said: "The Prime Minister should do the right thing and take a no deal off the table so that genuine dialogue can take place."