- He wrote the original script for Halloween III: Season of the Witch (1982), but had his name removed from the film after the script was heavily changed by director Tommy Lee Wallace.
- He was approached to write for the proposed BBC science fiction series Doctor Who (1963) but deplored the concept of the series and refused. He also refused an offer to write for Doomwatch (1970) and was asked to write for The X-Files (1993).
- His wife, Judith Kerr, was the best-selling author of the "Mog" series of children's books.
- He was best-known for his Quatermass trilogy and for his adaptation of George Orwell's "1984".
- Mark Gatiss described him as a "colossus" of television drama. According to Gatiss, The South Bank Show (1978) refused to make a programme about him.
- He was the father of art director and former actress Tacy Kneale and novelist Matthew Kneale.
- He graduated from RADA and became an Associate Member of RADA.
- He grew up on the Isle of Man.
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