I did a lot of BASIC and some 6502 programming on the BBC Micros in school. They were good machines and fairly powerful for the time. They were even networkable !
My friend wrote multiplayer network Battleships for his Computer Science A-Level project on them, we had distributed Mandlebrot / Julia Set rendering and we even had plans for a multiplayer, 3D, runaround-inna-maze killin-things game a loooong time before Wolfenstein was created.
BBCs had some good and innovative commercial games too that are still worth a bash today. Heard of Revs, Chuckie Egg, Thrust or Elite by any chance?