Noted in Scotland, My rear tyres were sometimes wearing against the rear wheel arch; especially when the car was fully laden: driver, passenger & luggage.
I had softened the shocks to 10 clicks which gave the rear end a little more bounce; The red circled area on the tyre is worn - but only the surface detail - it is hitting against the inside edge marked green when the suspension is on full compression.
15 minutes with the dremel, I took the wheel arch return edge back about 5mm on both sides, from 12 o'clock to 3 o'clock position & hardened up the rear shocks to +7 clicks in total. Combined this should mean the tyre just misses the arch - hopefully problem solved & invisible unless you crawl around on the ground and look for it:
Good excuse for a 50 mile test run around Kent; Maidstone, Bewl Water, Bedgebury and the scenic route back...