Tony Towers (MICHAEL SHEEN) is about to take the trip of a lifetime. It’s 1985 and he’s a successful nightclub manager, a local celebrity and engaged to a much younger woman, Sue (NATHALIE EMMANUEL). Things are going great. But when he embarks upon the 3:17 to Nottingham for a Christmas family reunion, things get a little strange. Moving up a carriage to the buffet car lands him in 1995, where he finds his clubs have failed and his life has fallen apart. Tony discovers that by moving up and down this fateful train, he can transport himself forward and backward to various stages of his life. Not only that, but the actions he takes in one carriage directly affect his life in the next. The question is, can Tony change his life – and the lives of the people he loves - for the better, or will he just make things worse?

Film correspondent HAYLEY DONAGHY asked MICHAEL SHEEN (Tony Towers) and NATHALIE EMMANUEL (Sue Taylor) about what drew them into their characters