Well, I have collected my car from York Audi after an interim service. They were great and immediately advised me of the internet offer of £370 for the service covering plugs, pollen filter, oil etc.
They even re-seated my front bumper and sorted a front parking sensor that had started beeping at fresh air in the last couple of days.
The car is now much more lively, probably proving that the plugs were past their best, or more likely cheap rubbish from the garage that I bought the car from as it has never been so eager.
The even seemed happy

to advise me of potential issues on the horizon including their costs at the bottom of my invoice just in case I wanted to get them done. They were certainly thorough in hunting out those 'you may need these items done before the next service' items.