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All the cast and crew credits appear at the end of the film. The credits include an acknowledgment to David Sherwin and Ken Levison for their assistance during the production of Sunday Bloody Sunday. The last card in the closing credits stated that the film was made by Vectia Films Ltd. for Vic Films and shot at Bray Studios, Windsor and on location in London. A June 1969 New York Times article indicated that director John Schlesinger and novelist, short story writer and film critic for the New Yorker Penelope Gilliatt would team up to film Sunday Bloody Sunday. The article indicates that the film would be produced for United Artists that coming fall in London. The script was Gilliatt's only feature film screenplay.
In January 1970, a Hollywood Reporter item announced the start of filming had been delayed but was now set for the following month. A February 1970 Daily Variety item stated that Ian Bannen had been cast to co-star with Glenda Jackson and Murray Head. After one month of shooting, however, Daily Variety announced that Bannen had contracted pneumonia and been replaced by Peter Finch. Filmfacts indicated that Vanessa Redgrave was initially considered for the role of "Alex Greville." The film marked the feature film debut of Daniel Day-Lewis, who makes a brief appearance as a young vandal.
Several reviews of the film praised the film's depiction of homosexuality and the performances of Finch and Jackson, in particular. The onscreen passionate kiss between Finch and Head was also noted in some reviews. The characters of Alex and "Daniel" share only one scene together, near the end of the film. The film concludes with Daniel addressing the camera directly to declare that although he knows "Bob" has a weak character, he made Daniel happy and, ultimately, they shared something worthwhile. Sunday Bloody Sunday received Academy Award nominations for Best Actor (Finch), Best Actress (Jackson), Best Director and Best Original Screenplay. Modern sources add Petra Markham to the cast.