My A3 2.0TDI is coming upto its first service on the longlife plan. Ive rung 3 dealerships and the have all quoted me in the region of £300. A localish VAG specialist has quoted my £175 all in. When I asked about the warrenty issue with AUDI they said because they use VAG parts and are VAT registered (what that has to do with it i dont know) then the warrenty will NOT be void with AUDI. Is this true? Am I ok to use the specialist with peice of mind that I am still covered with AUDI should I need to use them for warrenty work?