Took the car in to dealer this morning to have a look at the wheel damage and they reckoned £65 + VAT
saying the damage isn't "deep".
On the way there... another puncture
(not the damaged wheel though). At least this time it told me which wheel I suppose. That's two punctures in about 4 months. At this rate I'm going to be through my 5 tyre allowance before I know it!
Garage checked and the tyre was 1.2bar (about 1bar too low).