I was looking at the Stone Tape on You Tube. I've bookmarked the page for later.
Brian Clemens is very under-rated - the Irwin Allen of UK TV as far as his reputation goes but that's so unfair because so many people who don't know his output only recall his name from the goofier episodes of The Avengers but man he knew the business so well.
He could write a hell of a story or even just throw out a concept like The A-Squad which developed into one of my favourite programs of all time with good ol' Bodie and Doyle. I wouldn't go to the pub with me mates until after each weeks' episode had been on - Happy days.
Richard Matheson - Radio 4 Extra are repeating their excellent version of I am Legend just now - you can still get all the episodes on BBC Iplayer I think.
Check out a movie called "X The Unknown" from around 1956 - it was written with the intention of being a follow-up to Hammer's film version of the Quatermass Xperiment but Kneale himself didn't write it - he was doing Quatermass 2 for the beeb at the time I think - and when Hammer asked him to sanction it as a sequel Kneale refused to allow his characters to be used in it by to all intents and purposes it's a Quatermass movie - just without Quatermass himself.
There was also a BBC remake of The Quatermass Experiment a few years back - transmitted live I recall with Jason Flemyng as a younger version of Q. Hard to find but there's a documentary on Youtube about it called "Bring Something Back" (which was Kneale's original title for the first story.)