I loved Gamesmaster when it came out, it was something fresh and new, and Dominic Diamond was quite cool then (now he is an old bloke like me, and regularly appears on DIY channels on cable). DD has also done a games program on one of the cable channels which is pretty good, it's basically a pisstake of the other games programs, and doesn't take itself seriously. I can't remember what it's called, Gamey-something-or-another...
The set for Gamesmaster has appeared in a few different productions - if you are a fan of Red Dwarf, watch the Justice episode (can't remember the actual title of the episode, but it's the one where they defrost a mad cyborg and have to get to the prison ship). The prison ship is the same as the Gamesmaster studio - I think it's a water works near London?