Most famous for the NMI (No More Intelligence) series of demos (3 of them, although there nearly was a fourth) there's nothing else I've heard that they've done apart from this although the effects and general quality of the NMI demos is very good - well worth getting to watch. As far as I know too, there's only two members of the team - not bad going for the work that has been done.
Here's the programs I know of by them:
Groups page
Intro page
Spectrum Forever homepage
File last updated: Date Month 1995