For what it’s worth, I think £16,250 for a 48k coupe is outrageous, but £17-18k for a 15k miler seems very reasonable. There are very few left with that kind of mileage.
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Unfortunately, this part is pretty much unobtainium. Occasionally they come up, but people ask ambitious money for them.
The front bumper and wing are both bolt on/off components. See if you can’t get second hand colour matching panels before chucking loads of money at a respray.
DISA is easy to check.
VANOS is less easy, but any dropping off in performance should be detectable. It’s unlikely to spectacularly...
If you want to maintain a full service history, then it’s due an Inspection 2. This will undoubtedly help preserve the maximum value of your car, which I suspect is a primary driver if you are only doing 1-2k per year.
None of the servicing is necessary though, as none of the servicing...