Boris Johnson has just days to secure a new Brexit deal with the EU summit starting on Thursday in Brussels.Talks between the bloc and the UK are on a knife-edge with hopes and fears being routinely dashed in the run-up to the crunch talks. Here the PA news agency looks at some of the key players involved in negotiations:– Boris JohnsonIt should go without saying but it bears repeating that any final deal needs to be palatable to the man who will have to reap or bear the political repercussions.Boris Johnson promised throughout the Conservative Party leadership contest a more gung-ho approach to the negotiations and that has been borne out through clashes in the Commons over his language and whether he will obey the Benn Act, a law that looks to extend the Brexit deadline.The British Prime Minister currently looks to be totting up the numbers to determine whether, if there is a eureka moment coming in Brussels, he has the support to get a deal through the Commons. – Stephen BarclayThe British Brexit Secretary. Seen as a middle-of-the-road Leaver, he replaced Dominic Raab in the role when he resigned from Theresa May’s cabinet over the terms of her…