I know quite a few UK bands, but I live in the U.S. I will be working off of the Early Metal UK section in the poster from Metal Evolution in this post. I will add additional acts if I can think of them. Basically I stopped at 1980 for the Early Metal US and will likely do the same for UK. Actually technically I should have stopped at 1979, but I tossed Joan Jett in there at the last minute.
So if you have anything not on that poster that you want me to include that is 1979 or early feel free to send me some names. That'd help me out.