bmw workshop in coventry

hi everyone.

Im newbie here.. and just move to Coventry last week. I really need your idea or information regarding bmw workshop. Is there anyone knows where bmw independent specialist in Coventry?

and

Im also need some idea or advise how to aviod my rear tyres touching the bumper.

I just fitted my 18" 2 weeks ago. The front tyres with 225/40/18 and rear 255/40/18 and still using the standard absober.

Suddenly I realise the rear tyres are touching the bumper when i carried another 2 passangers with me.

I did ask my friends and he said i have to change the rear tyres to 255/35/18 or roll the fender.

But I also plan to lowered my car. I reckon when I lowered my car, the problem will coming back again.

Im so frustrated