So an update on my rattly door and start/stop issue as it went to the main dealer on Wednesday.
The rattly door is a common problem apparently on Audi's, although the technician I took out for a test said mine was the worst he'd heard. The doors seals and internal parts in the door need a special lubrication apparently (hmm probably WD40!) and there is a fixpack from Audi. So if anyone else notices a rattle from the doors when hitting bumps (quite often on the UK's s**t roads) that could be the problem.
As for the start/stop I had a wiring fault hence it not working from day 1. It's all working again now and it's good as I only do a short journey to work. Hopefully it'll improve my 21mpg average!!
Nottingham Audi after sales is brilliant and I would highly recommend them if you're local. It took them a couple of days to fix it but at least I had a loan car for as long as I needed it. Oh and they even washed and vac'd it for me!
They've got a red S3 in the showroom with black styling pack which looks mega. After having loads of red cars in a row a few years ago I vowed I'd never have a red car again, but when the new RS3 comes out this might change!!