I've only seen one episode of Quatermass, and it was bad... Avengers was sf? I'd pigeonholed it in my head with The Professionals! I'd forgotten Prisoner (bangs head against filing cabinet).
I'd definitely include both Threads and HHGG, the latter for the reason given below; the former because it was hugely memorable, though I don't think I'd like to watch it again.
The other thing that might be worth considering in this context (though, in the main, not sf) is drama featuring scientists. I'm thinking of things like The New Men from the CP Snow novel, which I think was tele-dramatised in the 1980s (or I might be completely making this up)?
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I'd definitely include both Threads and HHGG, the latter for the reason given below; the former because it was hugely memorable, though I don't think I'd like to watch it again.
The other thing that might be worth considering in this context (though, in the main, not sf) is drama featuring scientists. I'm thinking of things like The New Men from the CP Snow novel, which I think was tele-dramatised in the 1980s (or I might be completely making this up)?