I can't imagine the discs/calipers being smaller on the S3 than the Clubby or the R.
I have a pretty shocking memory. I can’t remember nine tenths of my family’s birthdays, I have no idea where I put the cheese grater last time I used it and generally I can never remember what I had for tea the day before never mind any other day in the week…
BUT I do randomly remember weird little details about cars. For instance I can remember just about every interior trim change in the MK2 Golf GTI’s lifetime (there were quite a few believe it or not) and other odds and sods like that.
This leads me to - I’m sure I saw that the current Audi S3 has smaller brakes than the Clubby and mk8R more akin to the previous generation S3 and 7R/7GTI PP.
I might be wrong but then again I might not be.
Oh and as for the service plans, the Audi techies use more expensive nitrile gloves, that’s where your money goes.
(Maybe Audi include more things as my £269 covered two oil changes and bugger all else. VW also dropped on me at the 2nd service that the aircon and brake fluid were also due to be changed and then a few weeks later told me the Haldex aldo needed doing at 2 years which may or may not account for the difference if Audi include stuff like that, and use a nicer air freshener when they Hoover and wash your car)
Not sure about the backs, but seemingly the 8R and 8Y S3 (probably the Clubby too, but couldn't confirm) have the same OEM 357mm x 34mm drilled and vented front discs.
If that's correct, those 14" discs need a caliper protrusion of probably no more than 35mm to fit that within the internal diameter of that 18" space saver. Seems an incredibly tight fit for the standard 18" rims of the R, Clubby or S3, but if 18" alloys should fit, an 18" spacesaver with the right offset should also fit.
As for the servicing costs, seems perhaps marginally cheaper than turn up on the day prices for the minor and major services,no big savings buying the pack, unlike the VW service pack offerings you'd be mad not to take up.
Scope of works seems the same - definitely excludes aircon (who needs a re-gas after 2 years anyway?), doesn't explicitly exclude brake fluid, doesn't mention to include it either, so probably doesn't include it. Would definitely avoid main dealer rates for stuff like haldex/DSG fluid changes unless they came in near VAG specialist rates.