I've got my facts slightly mixed up mate, terrible when your memory starts going. That's volume 1 you have there. James must've stepped in just after. I had same problem in Lincoln regarding import shops. We had one which closed in early 80s just as I was starting to earn money! Conway & Temple was the one that cost me a bit from back then.
There's an old website with Hammy's bible somewhere, will see if I can find it.
That's impressive mate, you have most of them. Last number on Discogs is 36, Sheila E which is fourth from end on your picture. Thanks for sharing.