I am going bonkers trying to name a UK TV programme in the late 60s, early 70s. It was sci fi and was just one word. It was on TV for quite a while and was very popular.
Could it be “Thunderbirds”?
Quatermass?
Doomwatch?
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Startrek?
Invaders?
magpie
rainbow
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loved watching that ,Roy Thinnes , a man on a solo mission to root out the aliens , I think they had a crocked little finger …
Stingray?
Andromeda?
Was it life action or cartoon?
Set in space or somewhere else?
The…Clangers? 
Doomwatch ?
Doctor.
Bill&Ben
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Timeslip
was a children’s sci-if TV series which was broadcast in the very early 1970s - I don’t think it ran for very long, though.
I think it was Independent TV trying to capture some of the BBC success with Dr Who but it didn’t work out.
Thank you to Bathsheba and Silver Tabby. It IS Doomwatch!
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Happy to help! 
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Oooh Robert Powell, I rather fell in love with him.
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