Runflat tyres were fitted to my car on the false premise that they were superior. Aside from maintaining stability in the rare event of a blowout, the disadvantages seem to outweigh the advantages by a long way. The salesman made much of the fact that you can continue driving with a puncture for up to 150 miles, yet the car company's website states 50 and there are a number of bloggers who claim less than that.

Also, punctured run flat tyres have to be discarded which is hardly good for the environment since they cannot normally be repaired. I got a nail in one after two and a half weeks and found this can be very expensive because the tyres are a good deal more costly than their normal equivalents. What really disturbs me is the disastrous ride over potholes and speed humps. Apart from the literally shocking alarm given to driver and passengers (the noise was like a hail of bullets), the bounce quality caused by the rigid sidewalls seems potentially dangerous - hitting the roof. Also, what about the suspension? How is this progress?