I've just had my second variable service done on my 1.8T (190), the car's two years old and has done 31000 miles. It cost me £237 from an independant. This included the standard long life service and the brake fluid change that you need after 2 years on the A4. I'd be interested to know how much other people have paid at dealers/independants for their servicing. I know someone who just had their TT done at a dealer and it cost £400 for the actual service and something like £150-£200 for the additional haldex service, I can't remember exact figures. I was happy with the place I went to, although a bit apprehensive at first as I'd never used anyone apart from a dealer before.