The Games Workshop High Street stores also used to have AD&D Traveller and Runequest and many other different games back in the 1980's. I have a game called Cosmic Encounter that I bought there. When my son was interested in the figures and saw people there were painting them, around about 2000, we went inside and I was surprised to see that it was now totally Warhammer 4000 gaming.Games Workshop basically turned it into a Warhammer franchise monthly expanded rulebook.
I actually thought that everyone had stopped playing AD&D and that the recent interest was just nostalgia brought upon by Stranger Things.