Question: The actor responsible for introducing the underground language polari to the British public, starred with Kenneth Williams in what show from 1965 to 1968?

full_context: Document 1: Round the Horne: Round the Horne is a BBC Radio comedy programme that was transmitted in four series of weekly episodes from 1965 until 1968. The series was created by Barry Took and Marty Feldman, with others contributing to later series after Feldman returned to performing, and starred Kenneth Horne, with Kenneth Williams, Hugh Paddick, Betty Marsden and Bill Pertwee. The show's announcer was Douglas Smith and from time to time he took part in the sketches. It had musical interludes by close harmony singing group the Fraser Hayes Four, and accompaniment by the big band of Edwin Braden ("the great, 'airy fool" according to Kenneth Williams), known as Edwin Braden and the Hornblowers. The band was actually the BBC Radio Orchestra but was never billed as such. In the fourth series, all the musical duties were performed by the smaller Max Harris Group. Took and the cast had worked on the predecessor series "Beyond Our Ken". The name is a pun on the nautical phrase for sailing around Cape Horn.
Document 2: Alan Freeman: Alan Leslie "Fluff" Freeman, MBE (6 July 1927 – 27 November 2006) was an Australian-born British disc jockey and radio personality in the United Kingdom for 40 years, best known for presenting "Pick of the Pops "from 1961 to 2000.
Document 3: Chuffer Dandridge: Chuffer Dandridge was a fictional Shakespearean actor-manager, whose emails were frequently read out by Terry Wogan on his BBC Radio 2 breakfast show "Wake Up to Wogan", which aired from 1993 until 2009.
Document 4: Hughie Green: Hugh Hughes Green (2 February 1920 – 3 May 1997) was an English television presenter.
Document 5: 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.
Document 6: Banter (radio show): Banter is a radio programme that is broadcast on BBC Radio 4 in the UK, starring Andrew Collins and Richard Herring. The pilot and the first 2 series were broadcast from August 2005 to November 2006, and a third series was broadcast in April and May 2008. There have been 19 half-hour episodes so far. The programme normally takes the form of invited guests naming their "top threes" in a given category.
Document 7: Julian and Sandy: Julian and Sandy were characters on the BBC radio comedy programme "Round the Horne" from 1965 to 1968 and were played by Hugh Paddick and Kenneth Williams respectively, with scripts written by Barry Took and Marty Feldman. According to a BBC Radio 4 programme on the characters, they were named after the writers Sandy Wilson and Julian Slade.
Document 8: Beyond Our Ken: Beyond Our Ken (1958–1964) is a radio comedy programme, the predecessor to "Round the Horne" (1965–1968). Both programmes starred Kenneth Horne, Kenneth Williams, Hugh Paddick, Betty Marsden and Bill Pertwee, with announcer Douglas Smith. Musical accompaniment was provided by the BBC Revue Orchestra. The name is a pun on Kenneth Horne's name and the (now mainly Northern English and Scots) word "", meaning "knowledge or perception".
Document 9: Beyond the Fringe: Beyond the Fringe was a British comedy stage revue written and performed by Peter Cook, Dudley Moore, Alan Bennett, and Jonathan Miller. It played in London's West End and then in America, both on tour and on New York's Broadway in the early 1960s. Hugely successful, it is widely regarded as seminal to the rise of satirical comedy in 1960s Britain.
Document 10: Horne &amp; Corden: Horne & Corden is a British sketch show written by Jon Brown, Steve Dawson, Andrew Dawson, Tim Inman and the cast, script edited by Sam Ward, and starring Mathew Horne and James Corden. It aired on BBC television in 2009. The first episode was broadcast on 10 March 2009 on BBC Three. It is presented by and stars Mathew Horne and James Corden in front of a live audience, featuring pre-recorded sketches (often on location) and vignettes filmed in a studio with an audience. Several episodes featured a song and dance routine as their finale. The first episode attracted the highest ratings for a comedy show debut on BBC Three. However, ratings quickly dropped throughout the show's run.
Document 11: Harry H. Corbett: Harry H. Corbett, OBE (28 February 192521 March 1982) was an English actor. Corbett is best known for his co-starring role in the popular and long-running BBC Television sitcom "Steptoe and Son" which was first broadcast in the 1960s and 1970s.
Document 12: Barrymore Plus Four: Barrymore Plus Four was a short-lived radio programme that aired from February to March 1995. There were eight half-hour episodes and it was broadcast on BBC Radio 2. It starred Michael Barrymore, Susie Blake, Robert Glenister, Harry Enfield, and Ted Robbins.
Document 13: Sound effect comedy: During the 1960s a new series of 'sound effect' comedies began with Dick Lester, Spike Milligan and Peter Sellers's "Running Jumping & Standing Still", continued through Eric Sykes's "The Plank", Barbara Windsor's "San Ferry Ann" and included four films with Ronnie Barker: "A Home of Your Own", "Futtock's End", "The Picnic", and "By the Sea".
Document 14: Fry and Laurie: Fry and Laurie are an English comedy double act, mostly active in the 1980s and 1990s. The duo consisted of Stephen Fry and Hugh Laurie, who met in 1980 through mutual friend Emma Thompson whilst all three attended the University of Cambridge. They initially gained prominence in a television sketch comedy, "A Bit of Fry & Laurie" (1987, 1989–1995), and have collaborated on numerous other projects including, most notably, the television series "Jeeves and Wooster" (1990–1993) in which they portrayed P. G. Wodehouse's literary characters Jeeves (Fry) and Wooster (Laurie).
Document 15: Hugh Paddick: Hugh William Paddick (22 August 1915 – 9 November 2000) was an English actor, whose most notable role was in the 1960s BBC radio show "Round the Horne", in sketches such as "Charles and Fiona" (as Charles) and "Julian and Sandy" (as Julian). Both he and Kenneth Williams are largely responsible for introducing the underground language polari to the British public.
ground_truth: Round the Horne