Question: Who is the writer of the British television sitcom for which David Jason is best known for his portrayal of Derek "Del Boy" Trotter?

Context paragraphs:
Sport Relief 2014 Special: The Sport Relief special, also referred to as "Beckham in Peckham" was an edition of the BBC sit-com, "Only Fools and Horses", recorded as part of the "Sport Relief 2014" appeal.  It was screened on 21 March 2014.  Actors David Jason and Nicholas Lyndhurst reprised their roles as Del Boy and Rodney in the sketch written by Jim Sullivan and Dan Sullivan, which included previously unused material written by their father John Sullivan, who created and wrote every episode of the series.  David Beckham guest starred.  Beckham was also the person that got in touch with Jim Sullivan, the son of the late "Only Fools and Horses" creator John Sullivan about doing something for "Sport Relief 2014".

Diamond Geezer: Diamond Geezer is a British television crime drama, broadcast on ITV1 between March 20, 2005 and April 23, 2007.  Created by Caleb Ranson, the series stars David Jason as jewel thief and professional con man Des.  Two series of the programme were broadcast.  A third series was not commissioned due to falling viewing figures, and Jason filming the first full series of "A Touch of Frost" since 2002.

Rock &amp; Chips: Rock & Chips is a British television comedy-drama and a prequel to the sitcom "Only Fools and Horses".  Set in 1960s Peckham, it focuses primarily on the lives of Del Trotter, Freddie Robdal and Joan and Reg Trotter.  Nicholas Lyndhurst, who played Rodney in "Only Fools and Horses", plays Robdal alongside James Buckley (Del Boy), Kellie Bright (Joan), Shaun Dingwall (Reg) and Phil Daniels (Grandad).  The Shazam Productions and BBC co-production was written by "Only Fools and Horses" creator John Sullivan, directed by Dewi Humphreys and produced by Gareth Gwenlan.

Ghostboat: Ghostboat is a 2006 British television film based on a novel by George E. Simpson and Neal R. Burger starring David Jason – a fantasy tale of His Majesty's Submarine "Scorpion" vanishing during the Second World War leaving only one crew member (David Jason) surviving.  38 years later in the Cold War year 1981, the "Scorpion" reappears; the crew have disappeared, but the vessel is otherwise unchanged and has not aged in the intervening years.  A Royal Navy crew along with the sole survivor of the original voyage is given the mission of retracing the last days of the boat prior to its 1943 disappearance.  A supernatural influence takes hold of most of the crew, and they start showing characteristics of the old crew.  They find themselves fighting Second World War ghosts.

Only Fools and Horses: Only Fools and Horses is a British television sitcom created and written by John Sullivan.  Seven series were originally broadcast on BBC One in the United Kingdom from 1981 to 1991, with sixteen sporadic Christmas specials aired until the end of the show in 2003.  Episodes are regularly repeated on UKTV comedy channel Gold, Yesterday and occasionally repeated on BBC One.

The Royal Bodyguard: The Royal Bodyguard is a British television sitcom, written by Mark Bussell and Justin Sbresni, and starring David Jason, Geoffrey Whitehead, Timothy Bentinck and Tim Downie.  A series of six episodes began on 26 December 2011, concluding on 30 January 2012.  The first episode picked up more than 8 million viewers but the series soon declined in ratings.  The series was heavily criticised by viewers and critics.  At 71 Jason was widely felt to be too old for the lead role.

Del Boy: Derek Edward Trotter, more commonly known as Del Boy (born 12 July 1945), is the fictional lead character in the popular BBC sitcom "Only Fools and Horses" and one of the main characters of its prequel, "Rock & Chips".  He was played by David Jason in the original series and was portrayed as a teenager by James Buckley in the prequel.  Del is known for his broken French quotes which are usually completely out of context and a variety of catchphrases, including: "He who dares – wins!" , "This time next year we'll be millionaires", "Lovely Jubbly!" , "You know it makes sense" (which he usually says to his customers after they've agreed on a deal) and "You plonker!"  (which he usually says to Rodney).

David Jason: Sir David John White, {'1': ", '2': ", '3': ", '4': "} (born 2 February 1940), better known by his stage name David Jason, is an English actor and comedian.  He is perhaps best known for his portrayals of Derek "Del Boy" Trotter in the BBC comedy series "Only Fools and Horses", and Detective Inspector Jack Frost in the ITV crime drama "A Touch of Frost".

The Top Secret Life of Edgar Briggs: The Top Secret Life Of Edgar Briggs was a 30-minute British television comedy series created by Bernard McKenna & Richard Laing and produced by Humphrey Barclay for LWT.  It was transmitted on the ITV network 15 September - 20 December 1974 and featured David Jason as the inept Edgar Briggs, personal assistant to the Commander of the British Secret Intelligence Service who, in spite of his cluelessness (and ineptness), manages to solve case after case.  It has been likened to the earlier American series "Get Smart".

Bruce Alexander (actor): Bruce John Alexander (born 18 June 1946 in Watford, Hertfordshire) is an English actor, best known for his portrayal of Superintendent Norman Mullet in the ITV television series "A Touch of Frost", where he plays the superior of the main character Jack Frost, played by David Jason.

Supporting paragraphs: David Jason Only Fools and Horses
Answer: John Sullivan