https://www.bbc.com/culture/article/20210322-why-dirk-bogarde-was-a-truly-dangerous-film-star

A motif across Bogarde performances is the capacity to show naked cruelty – all bone, no meat; all blade, no sheath. 1967’s Accident, another Bogarde-Losey-Pinter collaboration, is so full of dread that it is nearly unbearable. Bogarde worked with Losey a total of five times (1954’s The Sleeping Tiger, 1964’s King and Country and 1966’s Modesty Blaise were the other three) and had an extensive correspondence with both Losey and Losey’s wife, Patricia. Bogarde often had a tone of brotherly exasperation at his friend and collaborator’s downbeat nature. “Life is’nt [sic] all that bad, Joe. It can, actually, be fun if you try!” went a postcard dated 16 October 1969
The film was scripted by Harold Pinter, and Bogarde filled those famous Pinter pauses with crafty looks galore. “He conveyed thought and people read his thoughts,” said his co-star Fox in a the 2000 instalment of the British TV documentary strand Legends devoted to Bogarde.