Riddington was born in Leicester. Originally a stage actor, "truly dreadful" according to Riddington himself, he moved to a back stage role managing the Adelphi Theatre from 1950 and then directing the musical Rendezvous at the Comedy Theatre in 1952. Later, he managed the London Palladium and Palace Theatres in London's West End. After a period as a BBC television floor manager in the early 1970s, he became a producer. His first project as a producer to gain recognition was the 10 part serial adaptation of Anna Karenina (1977).
Subsequently Riddington produced several high-profile television series and serials, including Tenko (1981), The Citadel (1983), The House of Eliott (1991) and Andrew Davies's adaptations of Michael Dobbs' House of Cards trilogy — House of Cards (1990), To Play the King (1993) and The Final Cut (1995). Riddington was involved with several other projects scripted by Davies, including A Very Peculiar Practice (1986–88), a black comedy set in a university medical centre.
For a time during the 1980s, he was the acting Head of Series & Serials in the BBC drama department, before returning to front-line producing work. Ending his period at the BBC at the age of 75, he and his wife Liz Riddington enjoyed twelve years of retirement before Ken moved to a London nursing home, where he was treated for dementia.
- Simon Farquhar "Kenneth Riddington: Television drama producer best known for the original House of Cards as well as A Very Peculiar Practice", The Independent, 12 March 2015. Some sources give his year of births as 1920.
- "House of Cards producer Ken Riddington dies", Ariel, 8 January 2015
- Jane Elliott "Technology is helping unlock Ken's dementia memories", BBC News, 4 April 2010
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