Question: To Play the King is a 1993 television serial broadcast by  the world's oldest national broadcasting organisation and the largest broadcaster in the world by what?
Context: Target Luna was a British television serial broadcast by Associated Television in April 1960.  It was written by Malcolm Hulke and Eric Paice, directed by Adrian Brown and produced by Sydney Newman who went on to co-create "Doctor Who" for the BBC.  The first serial featured Frank Finlay as Conway Henderson and Michael Craze as Geoffrey Wedgewood.  The show was successful and spawned three sequels: Pathfinders in Space (September 1960), Pathfinders to Mars (December 1960 – January 1961), and Pathfinders to Venus (March 1961) starring Gerald Flood and Stewart Guidotti in the recast roles. To Play the King is a 1993 BBC television serial and the second part of the "House of Cards" trilogy.  Directed by Paul Seed, the serial was based on the Michael Dobbs' 1993 novel of the same name and adapted for television by Andrew Davies.  The opening and closing theme music for the TV series is entitled "Francis Urquhart's March", by composer Jim Parker.  The series details the conflict between British Prime Minister Francis Urquhart and a newly crowned king as well as the run-up to the general election. Dirt (styled d!rt for logos) is an American television serial broadcast on the FX network.  It premiered on January 2, 2007 and starred Courteney Cox as Lucy Spiller, the editor-in-chief of the first-of-its-kind "glossy tabloid" magazine DirtNow, which was previously two separate publications: "dirt" (a tabloid) and "Now" (a glossy magazine with a more respectable reputation). Looking for Clancy was a 1975 television serial broadcast on BBC2. Association football is the national sport in England, where the first modern set of rules for the code were established in 1863, which were a major influence on the development of the modern Laws of the Game.  With over 40,000 association football clubs, England has more clubs involved in the code than any other country as well as the world's first club (Sheffield F.C.), the world's oldest professional association football club (Notts County F.C), the oldest national governing body (the Football Association), the first national team, the oldest national knockout competition (the FA Cup) and the oldest national league (the English Football League).  Today England's top domestic league, the Premier League, is one of the most popular and richest sports leagues in the world, with six of the ten richest football clubs in the world. Aur Bhi Gham Hain Zamane Mein (Hindi: और भी ग़म हैं ज़माने में) was an Indian television serial broadcast fortnightly on Doordarshan in the early 1980s.  It spanned 32 episodes and combined entertainment with education, as each episode highlighted a social problem.  The name of the serial was an allusion to Faiz Ahmed Faiz's famous Urdu poem with a slightly different title, ""Aur Bhi Dukh Hain Zamane Mein"," in which a man explains to his beloved that he is distracted from being focused on her completely by the social injustice and pain he sees around him. Our Mutual Friend is a British television serial broadcast in 1998 and adapted from Charles Dickens's novel "Our Mutual Friend" (1864–1865). The Jury is a British television serial broadcast in 2002 (with a second series in 2011).  The series was the first ever to be allowed to film inside the historic Old Bailey courthouse. The British Broadcasting Corporation (BBC) is a British public service broadcaster with its headquarters at Broadcasting House in London.  The BBC is the world's oldest national broadcasting organisation and the largest broadcaster in the world by number of employees.  It employs over 20,950 staff in total, 16,672 of whom are in public sector broadcasting.  The total number of staff is 35,402 when part-time, flexible, and fixed contract staff are included. The Witness for the Prosecution is a 2016 British mystery drama thriller television serial broadcast on BBC One over Christmas 2016.  The two-part programme was adapted by Sarah Phelps and directed by Julian Jarrold and is based on Agatha Christie's short story of the same name.  The plot is based on Agatha Christie's original short story rather than the play, unlike Billy Wilder's 1957 film version.
Answer: number of employees