I have used A for Audi for 4 years now since buying my first A4. They are a county mile less expensive than Audi dealerships. This of course is a huge pulling power but beyond this they are genuinely nice folk. You simply won't be treated like this in a dealership. Nothing is a hassle, everything is explained (to the level and at the complexity that YOU wish) and you know that you are not being conned or having unnecessary work done. If you dread walking into a garage as you are not clued up on cars (national tyres, Kwik Fit, Dealerships) this is the place for you. No BS and genuinely welcomed and appreciated. Just don't consider anywhere else
Alan Ferris