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.
Raidió Teilifís Éireann (] ; "Radio [and] Television of Ireland"; abbreviated as RTÉ) is a semi-state company and the national public service broadcaster of the Republic of Ireland.
 It both produces programmes and broadcasts them on television, radio and the Internet.
 The radio service began on 1 January 1926, while regular television broadcasts began on 31 December 1961, making it one of the oldest continuously operating public service broadcasters in the world.
 RTÉ also publishes a weekly lifestyle magazine called the "RTÉ Guide".
The Scottish Digital Network (SDN) is a planned new public service broadcaster and online services provider in Scotland.
 It was the principal proposal of the Scottish Broadcasting Commission.
 The Scottish Broadcasting Commission published its final report in September 2008, with this as a its primary recommendation.
 On September 13, 2010, the Minister for Culture and External Affairs, Fiona Hyslop, requested Blair Jenkins, who had been the chair of the Scottish Broadcasting Commission to actively explore proposed options and business models for the establishment of a Scottish digital network to compete in public service broadcasting with the BBC Network in Scotland.
 On March 21, 2013, three bidders were announced as the finalists for the Scottish Wide Area Network (SWAN).
 They were British Telecom, a partnership of Cable & Wireless Worldwide with Virgin Media Business and Capita with Updata Infrastructure.
Richard Dinnick (born 22 January 1968) is a British screenwriter, novelist, comic book writer and audio playwright.
 He is the winner of the 2012 BBC Writersroom opportunity to create a new show and to write for TV on the BBC and went on to write for the CBeebies TV shows "Tree Fu Tom" and "Go Jetters" - amongst others - as well as Mind Candy's new "Moshi Monsters" TV show.
 He was one of six finalists in a 2014 BBC Academy opportunity to workshop a script for "Waterloo Road".
 In 2015 Dinnick became Head Writer on the new Disney TV show "Eena Meena Deeka" and in-development action adventure show "Captain Extraordinary".
 He was also a BAFTA Judge for Children's Drama and produced a session for the 2014 Children's Media Conference.
The Australian Public Service (APS) is the federal civil service of the Commonwealth of Australia responsible for the public administration, public policy, and public services of the departments and executive and statutory agencies of the Government of Australia.
 The Australian Public Service was established at the Federation of Australia in 1901 as the Commonwealth Public Service and modeled on the Westminster system and United Kingdom's Civil Service.
 The establishment and operation of the Australian Public Service is governed by the "Public Service Act 1999" of the Parliament of Australia as an "apolitical public service that is efficient and effective in serving the Government, the Parliament and the Australian public".
 The conduct of Australian public servants is also governed by a Code of Conduct and guided by the APS Values set by the Australian Public Service Commission.
Rai 1 (until May 2010 known as Rai Uno) is the flagship television channel of Rai, Italy's national public service broadcaster, and the most watched television channel in the country.
 It is a general interest channel, mainly focused on shows, movies and public service; its direct competitor is Mediaset's Canale 5.
Supriya Sahu (Hindi: सुप्रिया साहू) is a senior Indian bureaucrat from 1991 batch of Indian Administrative Service.
 Recently, she was selected by Prasar Bharati, India's public service broadcaster, to be the Director General of state broadcaster Doordarshan.
 Currently, Supriya is posted as Director General Doordarshan.
 This is after almost two years that state broadcaster will get a full-time Director General.
 Supriya Sahu's appointment as head of Doordarshan was cleared by the Appointments Committee of the Cabinet headed by the Prime Minister Narendra Modi.
Tree Fu Tom is a live-action/CGI CBeebies children's television program which has been shown on BBC and CBeebies in the UK and Universal Kids and NBC in the USA.
 It is set in a miniature magical countryside and village area (Treetopolis) on the top of a part of a trunk of a big tree in a British-type woodland, where the trunk turns horizontal and then vertical again.
 Its characters are mostly anthropomorphized arthropods (which are not to size scale with each other as in reality).
 The programme is aimed at 2-6 year olds.
Clan is a children's TV channel from the Spanish public service broadcaster TVE.
 Until 1 January 2007 it had time-shared with TVE 50 Años which has since closed.
 The service now broadcasts 24 hours a day.
 The channel is available free on digital terrestrial television (known as TDT in Spain) and on major subscription platforms.
 Although the channel primarily screens programming for children aged 12 and under, youth programming is shown during the evening and night (for example "Dawson Crece", or "Dawson's Creek").
 A mixture of Spanish and foreign programming is shown, all in the Spanish language.
 Both live-action and animation programming is featured on the channel.
Blue-Zoo Productions Ltd. is a UK-based computer animation studio.
 Founded in 2000 by Tom Box, Oli Hyatt, Adam Shaw and Nic Sims, it is mainly known for producing children's TV series, advertising commercials and short films.
 Some of the more popular children's shows the studio has produced are Tree Fu Tom, Alphablocks, Q Pootle 5 Digby Dragon and Numberblocks.

Question: Tree Fu Tom is a program shown on this public service broadcaster, which employs over how many staff in total?
Answer: 20,950