Question: What do Maurice Elvey and Peter Watkins have in common?

Context articles: Sword of Honour (film)
Mademoiselle Parley Voo
Peter Watkins
Mademoiselle from Armentieres (film)
Martin Duckworth
A Honeymoon Adventure
Maurice Elvey
Second Fiddle (1957 film)
The Fruitful Vine
Mr. Wu (1919 film)

Sword of Honour is a 1939 British drama film directed by Maurice Elvey and starring Geoffrey Toone, Sally Gray, Wally Patch and Peter Gawthorne.
 A recruit at Sandhurst initially makes a poor impression, but goes on to prove himself by riding in the Grand National.
Mademoiselle Parley Voo is a 1928 British silent drama film directed by Maurice Elvey and starring Estelle Brody, John Stuart and Alf Goddard.
 It was made as a sequel to Elvey's earlier hit "Mademoiselle from Armentieres" (1926), and was equally successful.
 Both films refer to the popular First World War song "Mademoiselle from Armentières".
 It was made at Lime Grove Studios in Shepherd's Bush.
Peter Watkins (born 29 October 1935) is an English film and television director.
 He was born in Norbiton, Surrey, lived in Sweden, Canada and Lithuania for many years, and now lives in France.
 He is one of the pioneers of docudrama.
 His films present pacifist and radical ideas in a nontraditional style.
 He mainly concentrates his works and ideas around the mass media and our relation/participation to a movie or television documentary.
Mademoiselle from Armentieres is a 1926 British World War I silent drama film directed by Maurice Elvey and starring Estelle Brody, John Stuart and Alf Goddard.
 The film was Elvey's first collaboration with screenwriter Victor Saville.
 It was followed by a 1928 sequel "Mademoiselle Parley Voo".
Martin Duckworth (born March 8, 1933) is a Canadian documentary director and cinematographer who was on staff at the National Film Board from 1963 to 1970 and has continued to work with them as a freelance filmmaker.
 He was cinematographer on more than 100 films, and directed or co-directed 30, most of them with the NFB.
 His credits as director include "12,000 Men" and "Return to Dresden" (Golden Sheaf awards at Yorkton, 1978 and 1986), "Wives’ Tale" (Quebec Critics’ Choice 1980), "No More Hiroshima" (Genie 1984), "Our Last Days in Moscow" (best direction FIFA1987), "Oliver Jones in Africa" (Mannheim Ducate 1990), and "Brush with Life" (Hot Docs Best Film 1994).
 His cinematography work has included "Christopher’s Movie Matinee", directed by Mort Ransen (1968), "Sad Song of Yellow Skin", by Michael Rubbo (1970), "Le bonhomme", by Pierre Maheu (1972), "La richesse des autres", by Maurice Bulbulian (1973), "Falasha" by Peter Raymont (1983), "La bombe en bonus", by Audrey Schirmer (1986), "Between Two Worlds" by Barry Greenwald (1990), "Seeing Red" by Julia Reichert (1993), "Maureen Forrester, the Diva in Winter", by Donald Winkler (1999), "Return to Kandahar" by Paul Jay (2003), "Professor Norman Cornett", by Alanis Obomsawin (2009), "Ma vie réelle", by Magnus Isacsson (2012), "Granny Power", by Jocelyn Clarke (2016).
 He has also worked as a cinematographer with such filmmakers as Gilles Groulx, Don Shebib, Laszlo Barna and Peter Watkins
A Honeymoon Adventure is a 1931 British thriller film directed by Maurice Elvey and starring Benita Hume, Peter Hannen and Harold Huth.
 Written in collaboration by Rupert Downing and Basil Dean, it follows a brilliant scientist and his wife who go on honeymoon to Scotland where they are nearly kidnapped by agents of a foreign power.
 The film was shot at Beaconsfield Studios.
 Location shooting, including the railway scenes took place in Scotland.
Maurice Elvey (11 November 1887 – 28 August 1967) was the most prolific film director in British history.
 He directed nearly 200 films between 1913 and 1957.
 During the silent film era he directed as many as twenty films per year.
 He also produced more than fifty films - his own as well as films directed by others.
Second Fiddle is a 1957 British comedy film directed by Maurice Elvey and starring Adrienne Corri, Thorley Walters, Lisa Gastoni and Richard Wattis.
 The film was produced by Robert Dunbar for Act Films Ltd.
 It was the final film of prolific director Maurice Elvey.
The Fruitful Vine is a 1921 British drama film directed by Maurice Elvey and starring Teddy Arundell, Peter Dear and Paulette del Baye.
 From the silent era, probably the most notable thing about the film was an early appearance of British actor Basil Rathbone, who was later to become famous for his portrayal of Sherlock Holmes.
Mr. Wu is a 1919 British drama film directed by Maurice Elvey and starring Matheson Lang, Roy Royston, Lillah McCarthy and Meggie Albanesi.
 It was based on a 1913 play "Mr. Wu" by Maurice Vernon and Harold Owen.
 During the filming Albanesi became infatuated with Lang.
 The picture was made by Stoll Pictures, and was one of their first major successes.
 Lon Chaney played the title role in a 1927 remake.
 The screenplay concerns a Chinese Mandarin who murders his daughter.