GSF service centre - any experience?

[GTRS]

Hi all
Today I chanced across the GSF (German Swedish French) service centre in Putney. I have used their parts before for my old Mercedes and know they supply non-OEM parts, albeit normally of good quality. The guy's surname is Qureshi. I have to say he didn't fill me with confidence that he knew the RS2 well (claimed to have worked on them a lot but didn't bite at anything specific). Anyone know of them?
Cheers
Graham

[S2tuner]

if he doesn't know of any specifics, then I think it's best to pass honestly...