Britain's main opposition Labour Party will not vote for a Brexit deal that offers little more than a ‘bridge to nowhere’, its foreign policy spokeswoman said on Sunday, increasing pressure on Prime Minister Theresa May.

‘I think they (the government) are going to come along and give us ... a ridiculous binary choice,’ Emily Thornberry told the BBC's Andrew Marr show.

‘Frankly if she (May) comes back with something which is just a fudge that she's cooked up with Brussels and it doesn't meet our tests, we are not going to vote for it ... We're not stupid, we're not voting for something that is essentially a bridge to nowhere.’