Senior Labour figures have warned a cross-party Brexit deal will be "impossible" to get through the Commons unless it includes a fresh public vote.

In an escalation of pressure on Labour leader Jeremy Corbyn, both shadow Brexit secretary Sir Keir Starmer and deputy leader Tom Watson said up to 150 of the party's MPs could oppose any deal without a Final Say vote attached.

It comes as cross-party talks enter their seventh week, with pressure on both Theresa May and Mr Corbyn to walk away from the negotiations.

The latest session of talks began on Monday evening, with patience wearing out in the Tory ranks about Ms May's leadership and the attempt to strike a deal with Mr Corbyn's party.

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Downing Street said the talks, which began in early April, had been "serious" but "difficult".

Asked if Monday's meeting between the negotiating teams was the "last chance" to make progress, the Prime Minister's official spokesman said: "Let's see how this evening plays out."

Foreign secretary Jeremy Hunt said this week would be "crunch week" for the cross-party negotiations, adding that another public vote "would be a betrayal of what people voted for, and we want to implement the first referendum".