Career: Davies performed his first stand-up gig in 1988, and by the early 1990s was a rising star, picking up rave reviews at Edinburgh. He later gave up playing clubs to concentrate on radio. His Radio 1 series, Alan's Big One FM, led to TV appearances on shows such as One Foot in the Grave, before he was cast as the lead in Jonathan Creek, the light-hearted mystery drama that made him a household name. Other acting work includes Bob and Rose, A Many Splintered Thing, The Brief, Marple, Angus, Thongs and Perfect Snogging (2008), Lewis and Whites. He presented the three-part documentary Alan Davies' Teenage Revolution for Channel 4 in 2010 and was a judge in 2011 on ITV talent show Show Me the Funny. He's also appeared in West End hit Auntie and Me. He has been a permanent panellist on irreverent quiz QI since the show began in 2003.

Career: During the 1980s, Quentin had small, supporting roles in a number of projects. In the early 1990s she made appearances in Harry Enfield and Chums before landing the role of Dorothy on Men Behaving Badly in 1992, which eventually ended in 1998. Jonathan Creek offered Quentin a chance to delve into slightly more serious territory. Acting projects since include Life Begins, Blue Murder, Life of Riley, Just William, Dead Boss, Switch and Dancing on the Edge. Quentin also presents Restoration Home (she has dabbled in property restoration herself on numerous occasions) and has begun a second TV career as a travelogue presenter thanks to series such as A Passage Through India and Caroline Quentin's Cornwall.

Career: Murphy's big break came in 1974 when he began playing George Roper alongside Joyce in the sitcom Man About the House. Joyce played his long-suffering wife Mildred. The popularity of Murphy and Joyce's characters led to them starring in their own spin-off sitcom George and Mildred. The hugely popular series ran on ITV for five series until 1979 and ended after Joyce died in 1980. Murphy and Joyce also starred in a stage version of George and Mildred and a spin-off movie. Murphy went on to star in The Incredible Mr Tanner, L for Lester, Lame Ducks, One Foot in the Grave, the Booze Cruise TV movies, Last of the Summer Wine, and The Cafe.

Career: Walker 's big break came in 1997 when she began playing DI Susan Taylor in ITV thriller Touching Evil opposite Robson Green. She played the role in two sequels. In 1999, she was cast in the lead role in post-apocalyptic drama The Last Train. In 2003, she joined the cast of BBC spy drama Spooks as Ruth Evershed. More recently, Walker has starred in Torn, Oliver Twist, Luther, MI-5, Heading Out, Prisoners' Wives, Scott & Bailey and Last Tango in Halifax.