LONDON (Reuters) - British Prime Minister Theresa May said on Monday she was  ambitious and positive  about the country s future and its negotiations to leave the European Union, describing the talks as being conducted in a  constructive spirit .  I am ambitious and positive about Britain s future and these negotiations,  she told parliament.  If we are going to take a step forward together it must be on the basis of joint effort and endeavor between the UK and the EU.  
UK PM May says she is 'ambitious and positive' about Brexit talks