Unfortunately I forgot to move my jack from Fenchurch to Lintilla when I switched cars last week (I blame the excitement of passing the MOT) so I had to wait at the side of the motorway for a pair of knights in shining armour to get out of bed and bring it to me. At least the weather was nice and clear, albeit rather chilly.
The tyre has a big rip on the inner sidewall. It's possible I ran over a sharp object I didn't see, but that seems unlikely. I was travelling in a straight line so I would have expected the front tyre to hit it instead. I have always been a bit suspicious of these tyres even though they are relatively unworn, because although I don't know exactly how old they are I do know they are a type that hasn't been made for a number of years. I think I am going to bite the bullet and buy a set of five new high-quality Bridgestones; the same ones that I have on Fenchurch. They are expensive by Morris Minor standards but cheap compared to the big wide tyres that most modern cars use.