This was shown on TV so may have been an episode of something, but ISTR it being a movie. I also remember it being in colour but it could have been B&W with colour added later.
The only details I remember was the use of what I think were cardboard cut-outs for humans transformed (drained? sucked dry?) by some alien influence, and the presence of some small black objects (small rocks? football sized or a little bigger) littering the area (desert/scrub IIRC, maybe South West US states).
It’s not Monolith Monsters or It Came From Outer Space as I’ve checked both.
Is it “Lifeforce” (1985)? http://www.imdb.com/title/tt0089489/?ref_=nv_sr_1
That movie scared the crap out of me when I was younger.
Unlikely. IMDB says Lifeforce is set in London.
Ya but remember there were black rock object things in it. And its all around the world I believe not just London. Haven’t seen it in a long time though.
Could it be Evolution?
http://imdb.com/rg/an_share/title/title/tt0251075/
Nevermind I see it’s from 50s/60s/70s
They Came From Beyond Space(1967)?
I think this was just solved by another poster on this site, but is it. . .”The Killings at Outpost Zeta”(1980)?
http://www.imdb.com/title/tt0168922/?ref_=rvi_tt