I had a cooper s for a while Peter.
Great fun to drive, felt very quick. Dreadful run flat tyres though.
I didn't change them as there were insurance problems if changed. The insurance company held that you never get a blowout at 80mph with them.
Mine did puncture though and cost a fortune to replace, they wouldn't repair.
Also used almost exactly twice as much petrol as it's computer was claiming.
I changed it for a convertible one after a year and that was even more fun.......
Nick