Question: English actor John Alderton plays Thomas Watkins in which British TV drama series?

full_context: Document 1: Richard Thomas (actor): Richard Earl Thomas (born June 13, 1951) is an American actor. He is best known for his leading role as budding author John-Boy Walton in the CBS drama "The Waltons", for which he won one Emmy Award and received nominations for another Emmy Award and two Golden Globe Awards. He also played Special Agent Frank Gaad on FX's crime drama series "The Americans" (2013–2016), appeared in Stephen King's mini series "IT" (1990), and had a supporting role in the comedy-drama film "Wonder Boys" (2000).
Document 2: John Altman (actor): John Clarkson Stewart (born 2 March 1952), known as John Altman, is an English actor and singer, perhaps best known for playing "Nasty" Nick Cotton in the popular BBC soap opera "EastEnders". He was among the show's original cast members appearing in the very first episode in February 1985 and appeared on the show on and off as a recurring character. His character was killed off in the 30th anniversary episode of the show which aired in February 2015. Altman has also appeared in several other television series and appeared in many stage productions. In 2010 he became the new frontman of the band Heavy Metal Kids following the death of former frontman Gary Holton in 1985.
Document 3: Thomas William Walker: Thomas William Walker, ONZM (2 July 1916 – 8 November 2010) was an Anglo-New Zealand soil scientist. He was known as "Tom" or "John" or "Johnnie" after the Johnnie Walker brand of whisky, or "The Prof" to students and latterly viewers of "Maggie's Garden Show". To his family he was "Baba".
Document 4: J. G. Devlin: James Gerard Devlin (8 October 1907 – 17 October 1991) was a Northern Irish actor who made his stage debut in 1931, and had long association with the Ulster Group Theatre. In a career spanning nearly sixty years, he played parts in TV productions such as "Z-Cars", "Dad's Army", "The New Avengers" and "Bread". He also guest starred, alongside Leonard Rossiter, in an episode of "Steptoe and Son", "The Desperate Hours". The writers of "Steptoe and Son" - Ray Galton and Alan Simpson - have since revealed that Devlin was second choice to play the part of Albert Steptoe in the series, behind Wilfrid Brambell. He also appeared as Father Dooley, a Catholic priest, in several episodes of Carla Lane's "Bread", his last television appearance.
Document 5: Paul Watkins (novelist): Paul Watkins (born January 1, 1964) is an American author who currently lives with his wife, Cathy, and two children, Emma and Oliver, in Hightstown, New Jersey. He is a teacher and writer-in-residence at The Peddie School, and formerly taught at Lawrenceville School. He attended the Dragon School, Oxford, Eton and Yale University. He received a B.A. from Yale and was a University Fellow at Syracuse University, New York. His recollections of his time at the Dragon School and Eton form his autobiographical work "Stand Before Your God: An American Schoolboy in England" (1993). He wrote his first book, "Night Over Day Over Night" (1988), when he was 16 years old.
Document 6: Thomas Watkins: Thomas David Watkins (c.1876 – ?) is a fictional character in the ITV drama "Upstairs, Downstairs" and its spin-off "Thomas & Sarah". He was portrayed by John Alderton.
Document 7: John Alderton: John Alderton (born 27 November 1940) is an English actor who is best known for his roles in "Upstairs, Downstairs", "Thomas & Sarah", "Wodehouse Playhouse", "Little Miss" (original TV series), "Please Sir!", and "Fireman Sam" (The original series). Alderton has often starred alongside his wife, Pauline Collins.
Document 8: Thomas &amp; Sarah: Thomas & Sarah is a British drama series that aired on ITV in 1979. A spin-off from the BAFTA Award-winning series "Upstairs, Downstairs", it stars John Alderton and Pauline Collins reprising their "Upstairs, Downstairs" roles.
Document 9: Gary Watson: Gary Watson (13 June 1930 in Shropshire, England) is a retired British television actor who started out as a stage actor most notably acting in Friedrich Hebbel's 1962 play "Judith" at Her Majesty's Theatre in London, England with Sean Connery. He was however best known for his appearances in British ITC productions of the 1960s including "The Avengers", "The Saint" and "Randall and Hopkirk (Deceased)" in 1969 in the last episode The Smile Behind the Veil. In 1966 he played in all 10 episodes of The Three Musketeers as Aramis starring alongside Brian Blessed and Jeremy Brett. He also appeared in the 1967 "Doctor Who" serial The Evil of the Daleks. He appeared alongside Anthony Hopkins in the 1972 Television series War and Peace. He played the semi-regular character of Det. Insp. Fred Connor in the long running BBC police drama Z-Cars between 1972 and 1974. In 1974 he played George Vavsor for 5 episodes in The Pallisers which also featured Jeremy Irons. In 1977, he played the role of Ross in the BBC series "Murder Most English" and also appeared in the 1988 BBC adaptation of Macbeth playing MacDuff. He was also much employed as a reader and narrator, featuring in dozens of commercials throughout the 1980s and 1990s, particularly noted for his work in British Transport Films, Lloyds Bank and Nescafé adverts.
Document 10: Dowster: Dowster or DJ Dowster, also known as David Thomas, (Born in Newport, South Wales, 1 March 1977), is a record producer, singer-songwriter and disc jockey from Cwmbran in South Wales. David has been involved in the rave scene since 1998 and his love of the music lead him to begin his DJ career in
Document 11: John Nettles: John Vivian Drummond Nettles, OBE (born 11 October 1943) is a British actor and writer. Nettles is perhaps best known for playing the lead roles in the long-running television series "Bergerac" and "Midsomer Murders".
Document 12: Thomas W. Watson: Thomas Watson is a co-founder and former Vice Chairman of the Omnicom Group, Inc. and consults for Omnicom on management education and leadership development as Dean Emeritus of Omnicom University, Residency and Diversity programs.
Document 13: Richard Bellamy (Upstairs, Downstairs character): Richard Pemberton Bellamy, Viscount Bellamy of Haversham (1853–before 1936) is a fictional character in the ITV period drama "Upstairs, Downstairs", that was originally broadcast for five series from 1971 to 1975. He was portrayed by David Langton. In the 2010 revival of "Upstairs, Downstairs", Rose Buck refers to her late Master, Lord Richard Bellamy of Haversham, with the implication that Richard had died sometime between 1930 and 1936.
Document 14: Joan Sanderson: Joan Sanderson (24 November 1912 – 24 May 1992) was an English television and stage actress. During a long career, the tall and commanding actress played dowagers, spinsters and matrons, as well as intense Shakespearean roles. Her television work included the sitcoms, "Please Sir!" (1968–72) and "Me and My Girl" (1984–88).
Document 15: Joan Collins: Dame Joan Henrietta Collins, DBE (born 23 May 1933) is an English actress, author and columnist. Born in Paddington, west London, and brought up in Maida Vale, Collins grew up during the Second World War. After making her stage debut in the Henrik Ibsen play "A Doll's House" at the age of nine, she trained as an actress at the Royal Academy of Dramatic Art (RADA) in London. She then signed an exclusive contract with the Rank Organisation and appeared in various British films.
ground_truth: Upstairs, Downstairs