UK Labour forced into backing Brexit vote

With the clock running out on the amount of time to negotiate Brexit, the UK Labour Party has been left with no option but to back another nationwide vote.

Another plebiscite on Brexit is looking likely, with it now getting reluctant Labour support. (AAP)

Britain's opposition Labour Party does not want a second Brexit referendum but has been forced into supporting one by Prime Minister Theresa May running down the clock on negotiations, Labour's finance spokesman John McDonnell said.

This week Labour said it would back a second referendum in order to try to prevent either a 'no deal' or May's deal. With less than a month until Britain is due to leave on March 29, May is yet to win parliament's approval for her deal.

"We have been forced into this by Theresa May delaying, running down the clock," McDonnell told Sky News, saying Labour is still pushing to get its alternative Brexit plan adopted.

"If we can't get that we will have to break the log jam by going back to the people. It is not what we want but it is what we have been forced into."

However, Labour MP Caroline Flint says as many as 70 of her party oppose holding a second Brexit referendum.

"I think there are something like 60-70 Labour members of Parliament who feel as strongly as I do against a second referendum," said Flint, who represents an area of Britain which voted to leave the EU at the 2016 referendum.