I'll throw my 2p in too, fixed price servicing is quite a good deal for the A8, I serviced my D3 myself, D4 has been done by the dealer. Once was FOC, 2nd time was £199 and they did the pollen filter FOC. They also did a couple of other minor repairs FOC, gave me a A7 as a loaner, delivered the car back to me!
Not sure if I will keep it up next time, but not bad value for money this time round
