Aw ok thanks Styxz - I didn't realise QST was closed and thought it may have been someone else handling the forum input. Kim informed me last month that the 8V S3 M-Cantronic couldn't be reprogrammed for the RS3 but the QST poster above says it can!
I'm so confused - in Audi tuner it did say the RS3 M-Cantronic was still being developed so maybe this is a new development - fingers crossed!