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@ChasnotRobert
The sidewall issue that necessitated the tube was not actually a hole (this was the 2nd problem), it just seemed to have gone porous. I assume this was due to riding the tyre with low pressure, putting too much flex into the sidewall.
OTOH, could have got grazed by a rock, who knows? I'd ridden 300km in mainly shit weather so everything was covered in filth.