The multi-million UK games industry was established in the early/mid 80s not by a "demo scene" or by the BBC, but almost entirely on the back of popular Sinclair home computers (ZX80, ZX81 and ZX Spectrum), by people programming games at home and software houses that in some cases became giants.
DMA/Rockstar is in fact a prime example of the later echoes - see also Ocean, Ultimate, Gremlin et al - of that Sinclair-inspired industry; its origins are in a Scottish computer club in the early 80s, using and writing games for the Spectrum.
(As an aside, GTA itself was probably influenced by a popular and pioneering Spectrum game from 1986, Turbo Esprit).
DMA/Rockstar is in fact a prime example of the later echoes - see also Ocean, Ultimate, Gremlin et al - of that Sinclair-inspired industry; its origins are in a Scottish computer club in the early 80s, using and writing games for the Spectrum.
(As an aside, GTA itself was probably influenced by a popular and pioneering Spectrum game from 1986, Turbo Esprit).