Question: Which cast in The Boys in Blue is best known as one half of the double act Cannon and Ball?

Context paragraphs:
Ben Miller: Bennet Evan "Ben" Miller (born 24 February 1966) is an English comedian, actor and director.  He is best known as one half of comedy double act Armstrong and Miller, with Alexander Armstrong.  Miller and Armstrong wrote and starred in the Channel 4 sketch show "Armstrong and Miller", as well as the BBC sketch show "The Armstrong & Miller Show".  Miller is also known for playing the lead role of DI Richard Poole in the first 2 series of the BBC Crime Drama "Death in Paradise".

Dominic Wood: Dominic Simon Wood (born 3 January 1978 in Exeter, Devon) is an English entertainer, magician and presenter of radio and television, best known as one half of the double act Dick and Dom, with the other being Richard McCourt.  From 14 October 2007 to September 2008, he and work partner McCourt presented the Sunday morning show on BBC Radio 1 from 10:00am – 1:00pm, but later left the show due to TV commitments.

The Cannon and Ball Show: The Cannon and Ball Show was a successful comedy variety show on ITV featuring the double act comprising Bobby Ball and Tommy Cannon.

Hugh Laurie: James Hugh Calum Laurie, {'1': ", '2': ", '3': ", '4': "} ( ; born 11 June 1959) is an English actor, director, musician, singer, comedian, and author.  He became known as one half of the Fry and Laurie double act with his friend and comedy partner Stephen Fry, whom he joined in the cast of "A Bit of Fry & Laurie", "Blackadder", and "Jeeves and Wooster" in the 1980s and 1990s.

The Boys in Blue: The Boys in Blue is a 1982 British comedy film directed by Val Guest and starring Tommy Cannon, Bobby Ball, Suzanne Danielle and Roy Kinnear.  It is loosely based on the 1938 Will Hay film "Ask a Policeman", which Guest co-wrote.  Some policemen who have failed to make any arrests are threatened with dismissal, and begin to invent crime to justify their existence.  It was the final feature film that Guest directed.

Tommy Cannon: Thomas Derbyshire, known professionally as Tommy Cannon (born 27 June 1938), is an English comedian and singer.  He is best knows as the straight man of comedy double act Cannon and Ball, along with Bobby Ball.  He is most well known for the show "The Cannon and Ball Show".

Mark Arden: Mark Arden (born 31 July 1956) is an English comedian and actor, best known for being one half of comic double act "The Oblivion Boys" with Stephen Frost.

Inel Tomlinson: Inel Tomlinson is a TV personality and stand-up comedian from London, best known for being one half of Johnny and Inel, the UK's first black comedy double act.  As part of Johnny and Inel, the duo are well known on Kids TV for their hit CBBC TV comedy show 'The Johnny & Inel Show' and Junior Vets on Call.  In 2015, the pair joined the Fubar Radio team and took over the airwaves with their Thursday afternoon 'Live & Loud' show.  After a successful year at Fubar Radio, the duo were invited to join the all-new Virgin Radio UK lineup in a prime Friday night 7pm-11pm slot.

Cannon and Ball: Tommy Cannon (born Thomas Derbyshire, 27 June 1938) and Bobby Ball (born Robert Harper, 28 January 1944), known collectively as Cannon and Ball, are an English comedy double act best known for their comedy variety show "The Cannon and Ball Show", which lasted for nine years on ITV.  The duo met in the early 1960s while working as welders in Oldham, Lancashire.  They started out as singers working the pubs and clubs of Greater Manchester and switched to comedy after being told comics earned an extra £3 a night.

Bobby Ball: Robert Harper, known professionally as Bobby Ball (born 28 January 1944), is an English comedian, actor and singer.  He is best known as one half of the double act Cannon and Ball, with Tommy Cannon.  They hosted their own ITV show "The Cannon and Ball Show" for nine years between 1979 and 1988.  Ball has since gone on to star in various sitcoms and dramas including "Last of the Summer Wine", "Heartbeat" and "Not Going Out".

Supporting paragraphs: The Boys in Blue Bobby Ball
Answer: Bobby Ball