Question: Which BBC drama would be referenced in the biographical television film, Hancock and Joan?
Context: Mother Teresa of Calcutta is a 2003 biographical television film based on the life of Mother Teresa, the founder of the Missionaries of Charity religious institute.  The film stars Olivia Hussey in the title role and received a CAMIE award in 2007.  The film was originally produced as the Italian television miniseries "". Maxine Peake (born 14 July 1974) is an English stage, radio, film and television actress, who made her name as Twinkle in Victoria Wood's sitcom "Dinnerladies".  She has since played Veronica Ball in Channel 4's Manchester-based comedy drama series "Shameless", barrister Martha Costello in the BBC legal drama "Silk" and Grace Middleton in "The Village".  She is also an accomplished stage actress, having played the title role in "Hamlet". Path to War is a 2002 American biographical television film, produced by HBO and directed by John Frankenheimer that deals directly with the Vietnam War as seen through the eyes of United States President Lyndon B. Johnson and his cabinet members.  It was the final film (theatrical or made-for-TV) that was directed by Frankenheimer, who died seven weeks after the film debuted on HBO.  It was also the last film produced by Edgar J. Scherick during his lifetime−he died seven months after its initial airing on HBO. Morgana O'Reilly (born 19 August 1985) is a New Zealand film, television and theatre actress.  She has appeared in several theatre productions and created the one-woman play "The Height of the Eiffel Tower".  O'Reilly played Lynn Matthews in the biographical television film "Billy" and guested in "Nothing Trivial".  She has also appeared in the comedy series' "Sunny Skies" and "This is Littleton".  O'Reilly joined the cast of "Neighbours" as Naomi Canning in December 2013, and starred as Kylie Bucknell in the horror-comedy "Housebound". Enid is a 2009 British biographical television film first broadcast on 16 November on BBC Four.  Directed by James Hawes it is based on the life of children's writer Enid Blyton, portrayed by Helena Bonham Carter.  The film introduced the two main lovers of Blyton's life.  Her first husband Hugh Pollock, who was also her publisher, was played by Matthew Macfadyen.  Kenneth Darrell Waters, a London surgeon who became Blyton's second husband, was portrayed by Denis Lawson.  The film explored how the orderly, reassuringly clear worlds Blyton created within her stories contrasted with the complexity of her own personal life. Loved Up is a BBC drama, first shown on 23 September 1995 in the BBC 2 "Love Bites" series.  The film was directed by Peter Cattaneo, who would go on to direct the feature films "The Full Monty" (1997) and "Lucky Break" (2001).  Starring Lena Headey, Ian Hart and Jason Isaacs, it includes an early appearance by Danny Dyer, who subsequently starred in the 1999 film, "Human Traffic", which explored similar themes of clubbing and drug culture.  The drama is notable for being the first collaboration between BBC Drama Screen Two ( BBC Two ) and "Scene" (BBC Education) with series associate producer Andy Rowley.  "Loved Up" won a BAFTA award as Best Children's Drama in 1996 Hancock and Joan is a 2008 British biographical television film based on the affair between the comedian Tony Hancock and Joan Le Mesurier, the third wife of actor John Le Mesurier.  It was first transmitted on BBC Four on 26 March 2008 as part of the "Curse of Comedy" season.  It features Ken Stott and Maxine Peake as the title characters, and Alex Jennings as John.  Written by Richard Cottan, directed by Richard Laxton and produced by Simon Heath, it was made by World Productions for the BBC. General Motors Theatre (also known as CBC Theatre and General Motors Presents) was a Canadian television anthology series, which ran on CBC Television under its various titles from 1953 until 1961.  First transmitted under the sponsored title on October 5, 1954, a new 60-minute drama would be presented each week.  As suggested by the title, the programme was sponsored by the General Motors automobile company.  It was effectively the same series as the unsponsored "CBC Theatre", which had run its first season from December 1, 1953 to April 20, 1954, with General Motors becoming title sponsor for the second season. An Adventure in Space and Time is a 2013 British biographical television film focusing on the creation of the popular science fiction television series "Doctor Who" in the 1960s, with emphasis on actor William Hartnell, who portrayed the original incarnation of the show's main character, the Doctor.  It was directed by Terry McDonough, and written by regular "Doctor Who" writer Mark Gatiss.  It premiered on BBC Two in the United Kingdom on 21 November 2013, and later that year in the rest of the world. The Miracle Worker is a 2000 biographical television film based on the 1959 play of the same title by William Gibson, which originated as a 1957 broadcast of the television anthology series "Playhouse 90".  Gibson's original source material was "The Story of My Life", the 1902 autobiography of Helen Keller.  The play was adapted for the screen twice before, in 1962 and 1979.  The film is based on the life of Helen Keller and Anne Sullivan's struggles to teach her.
Answer: Silk