Into repair mode
Stopped on the side of the road, luckily there was a pavement and not too far from civilisation (note the garage on the left). Couldn't see any obvious sign of damage to the cover until it came off and there were 3 places where it looked like cuts to the fabric had gone all the way through. The first assessment was someone would have to give me a lift home or at least bring a new tyre out but, necessity being the mother of invention, three carefully placed large patches, glued to the inside of the tyre, was the approach I took. The old tube was not repairable but there was a new one in the trusty rucksack and when fitted, and air put in, seemed to be OK. It seemed prudent to head straight back home which proved a good option, no further trouble.
Covered just under 21 today, guess who is going to be busy this afternoon!