He played a comedian in "Festival" is a 2005 British black comedy about a number of people at the Edinburgh Festival Fringe directed by Annie Griffin. The general shots of the festival were filmed during the 2004 event. Mangan was nominated for a Scottish BAFTA for his performance. "Confetti", a 2006 British mockumentary romantic comedy film, was released on 5 May 2006. It was conceived and directed by Debbie Isitt and stars many British comedians, including Jessica Stevenson, Jimmy Carr, Martin Freeman, Mark Heap, Julia Davis, Robert Webb, and Olivia Colman. It follows a bridal magazine competition for the most original wedding, the ultimate prize being a house, and the three couples who are chosen to compete. Mangan plays one of the grooms, a professional tennis player. He starred in "Beyond the Pole", a 2010 British mockumentary adapted from the cult BBC radio series of the same name. It received its UK cinema release in 2010. It was directed and produced by David L. Williams. The film was shot on floating sea ice off the coast of Greenland, and stars an acclaimed cast of actors and comedians including Mangan, Rhys Thomas, Mark Benton, Alexander Skarsgard and Helen Baxendale. "Variety" magazine described the film as a cross between "The Office" and "Touching the Void". In 2013 Mangan played Alastair Caldwell in "Rush", a British-German biographical sports drama film centered on the rivalry between race car drivers James Hunt and Niki Lauda during the 1976 Formula One motor-racing season. It was written by Peter Morgan, directed by Ron Howard and stars Chris Hemsworth as Hunt and Daniel Brühl as Lauda. The film premiered in London on 2 September 2013 and was shown at the 2013 Toronto International Film Festival before its UK and US theatrical releases on, respectively, 13 and 20 September 2013. In 2014, Mangan voiced the title role in "", a British 3D computer-animated comedy film featuring Postman Pat, star of a long-running BBC children's series. It was originally due to be released on 24 May 2013, but was pushed back to a year later. Pat's singing voice was performed by Ronan Keating. Other voice actors in the film included Jim Broadbent, Rupert Grint, and David Tennant. In 2020, it was announced Mangan is to write his first film, an adaptation of the children’s novel Harry And The Wrinklies. Mangan was host of the Evening Standard British Film Awards for four years (2009–2013).