Don't know about S2 tyres but autoquick on whitemyres (at the back of lang stracht) are good for your brake work.
Steve Deans is the guy there I speak to & he's good lad.
He probably won't skim the discs but will tell you honestly whether you need new ones or not.
Depending on what he tells you, you're better to source whatever spec of brake parts from elise parts any way & giving them to him to fit.
I've heard autotecnic are good too but have never used them.
cheers