Hi Jon,
I have a Mini One Seven fitted with Factory Sports Suspension and 18"x7.5 Wheels with an Offset of 42, Tyres are 215/35x18 (Standard not Run Flats).
Ride is very hard and the wheels follow tram lines in the road, I've not fitted steering lock limiters and have had no issues with rubbing on full lock, also not had any rubbing issues when passengers are carried.