So the service is based on 7 years or 105k whichever is first:
There's a big difference between 39k miles and 105k miles on plugs. i wouldn't imagine the fact the time factor makes anywhere near as much impact on the performance of the plugs to the mileage.
As for the belt its a dedicated supercharger belt and powers nothing else i think, I'm not sure what happens if the belt snaps and the charger stops spinning in terms of negative effect on other components if any.
On the S-Type R I had before my XF the Plugs and SC-Belt were 100,000 miles or 10 years interval - I doubt the newer components have a shorter lifespan- my guess is the 7 years/105k is all down to the higher mileage interval between services that the XF has (the S Type R was every 10k/12 months)
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