As the old blue one has become the other half's daily driver, I thought I'd better get the slow puncture in the front tyre repaired. It's had it since I bought the car and never really bothered me, I just gave it a blast of air every week or so at the workshop.
Dropped wheel off at local tyre wizard, expecting to have to boost their tea fund in exchange for having the bead area on the rim polished and was surprised when I went to collect to be told that they wouldn't fix it and in their opinion, it was bloody dangerous.
Found this damage to tyre around the bead wires and inside the seating area:
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They'd never seen anything quite like it before, neither have I.
Best guess would be that when the tyre was initially fitted, the oik that did it misused the tyre machine that pushed the tyre onto the rim and somehow ripped/ tore the rubber without breaking the bead wires. None of the missing rubber was inside the tyre and it would have no way of getting out.
Of course, the next problem was finding a single Grabber AT2 of the appropriate 16" size to replace it. No chance of that, could get a new AT3 for £130 (!) but I'm old fashioned and think tyres should match on axles, as well as being skint and not wanting to pay that sort of cash.
Managed to track down a good used on the bay for £48. I'll see how good and used it is when it turns up tomorrow.
Moral of the story- if it ain't broke, don't fix it...