I have my mini in today for its last TLC service. I know i needed x2 front tyres. I sort these out cheaply my self off of the net and use a local tyre fitter £9 per tyre fitted.
However mini (knights in Stoke) Have fitted me x2 Continental Sport Contact 3
205/45/R17 For £250 . I pretty pleased with this price. They sort of matched the internet price of £253 for the newer sport contact 5 I quoted. The sport contact 3 has good reviews so happy with a main dealer for once