I think the 17s have a different offset to the 18s. I know someone with 17s and 20mm spacers on the back though. I don't think he has anything on the front. I would have thought that 12mm ones would be fine though.
I've had the springs and spacers for quite a while waiting to go on - just needed the car lol. Might as well do it when the car is new and the bolts all come undone easily and the dampers aren't so easily upset by a different ride height.
I'd like to introduce you to 'Smurf' - he's my 2016 S1. I've just picked him up today.
Spec is as follows:
Audi Exclusive Paint - Porsche Riviera Blue
Exterior Quattro Pack
Interior Quattro Pack
Auto Dimming Rear View Mirror
Audi Sound System...
I don't think running in is as important as it was years ago. I would be gentle for the first few hundred miles though.
Chemist - I'm not sure. I'm going in to collect mine.
I nipped down to the dealers for a sneaky preview of mine in the compound. He's so pretty!!!