Due to some promising feedback on these forums about ABtech Southampton, got them to do my circa 74K service and cam belt change. This is on my 2.5TDi Quattro Sport. Cost in total £975. Did the cam belt, pulleys, water pump (their recommendation) and I got them to change the Thermostat due to some recent fluctations on the temp guage (commonly reported fault with A4s!). All using Audi parts. They impressed me with their knowledge and I can not fault the job, not a screw out of place etc. under close inspection. They claim that the cam belt is due at 74K on the V6 tdi, owners take note.