'' Coalition '' is a 2015 British television film about the formation of a coalition government following the 2010 United Kingdom general election . It was broadcast on Channel 4 on 28 March 2015 , shortly before that year 's general election . The film was written by James Graham and starred Bertie Carvel as Nick Clegg , Ian Grieve as Gordon Brown , and Mark Dexter as David Cameron . Graham wrote the film in the aim of giving humanity and enabling empathy to all of the figures portrayed within it , which earned it positive reviews from critics
the formation
2010 United Kingdom government formation
Coalition (film)