I do happen to be a John Wyndham fan and try to track down adaptations, and yes, the BBC one is the best (I remember watching it when it was first aired). The newer remake with Eddie Izzard was disappointing. I'm often surprised that his stories don't get more adaptations - where's Kraken Wakes and The Chrysalids? (Chocky was made into a good kids TV series back in the day).

I hadn't heard of Survivors, but that looks right up my street. I used to be massively into Doctor Who and the Terry Nation novels. I can only find the first season easily.