British Prime Minister Theresa May said on Monday she was ready to walk away from Brexit negotiations without a deal with the European Union if the agreement wasn't good enough.

"We will be there to negotiate the right deal but what I have said is that no deal is better than a bad deal. We have to be prepared to walk out," she said to applause during a Sky News interview on Monday.

Britons elect a new government in ten days' time as polls show May's Conservatives are seeing their lead over the opposition Labour Party narrow.