A few weeks ago you published a letter from a reader that gave details of a company that could supply runflat tyres for his BMW at less cost than a BMW dealer would charge. I cut the letter out for future reference, but now find I have lost it. May I trouble you to let me have the necessary details because my car will shortly be needing new tyres. Is there anything special about these tyres which mean only a BMW dealer should fit them? Many Thanks.