At the risk of offending a lot of geeks, British sci-fi TV is a pretty easy thing to be an expert in. If you’re in your 30s or 40s, your parents probably remember when the subgenre started existing.

With the centenary of his birth, screenwriter Nigel Kneale is being celebrated for his varied work – including his landmark 1950s dramas about an alien-infested UK, writes Adam Scovell. Today marks ...