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A lot of UFO pics came up when I (fruitlessly, I'm afraid) searched for that, because of the silver costumes they wore. The wigs were purple, not green.
The only 70s era live-action British sci-fi with kind of a UFO vibe I can think of right now is the rather bizarre Star Maidens
. According to The Other Wiki it shared its production designer with Space: 1999 and recycled some of the props and sound effects. I've had a look at this You Tube clip https://www.youtube.com/watch?v=vaDLf2wJ9Jg (featuring a pre-Blake Gareth Thomas!), and though I can't see any of the wigs you mention, the inhabitants of the female dominated planet do live in subterranean cities following a disaster.
Hi, in what was probably the late 70s or early 80s I watched what I believe was a few episodes of a British sci fi series (although my memory may be so flawed that it was a movie) and the images I have from is are: - it was post-apocalyptic - all the survivors were living underground in a big complex - all the women wore silver metallic wigs (like the green ones from moonbase on UFO), I think because they were all bald - except for the protagonist who had long dark hair that she had to keep hiding under her silver wig so that no one knew she was different - she came out onto the surface through a manhole and went exploring
Ring any bells for anyone?
Thanks in advance.