Out of interest, I have now had the 100k mile treat for my car done by Quattro Tech of Peterborough and was extremely pleased with both the company and the cost. They changed the cam belt and water pump, oil in the DSG gearbox, all main filters (pollen, air and oil), undertook a major service and changed the headlamp bulbs for nightbreakers. In addition they did a full health check of all the cars major components, (brakes, suspension, fluids etc)(all green) annual MOT and it came in around the £1150 mark. Driven 4k miles since and as mentioned, very pleased.