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Howard-
Yes it is called mile munching.
https://yacf.co.uk/forum/index.php?topic=87521.msg1826101#msg1826101
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Thankfully 33mm Racing Ralphs, so in real world usage they will never see such pressures.
fussballclub
Jon.
Seems the valve collar just needed a bit more tightening - it's holding air now.
It also turns out not to be a good idea to pump a tyre up to it's rated pressure to check for leaks. 85 psi exploding in my hands: ears ringing, sealant across the flat and neighbours thinking I've shot myself.