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Airhead
Yeah, Mark the MG mechanic said he's never seen a hole like that in the too if a piston in 25 years.
It can't all have been down to my driving, can it?
Apparently it was running lean which caused a hot combustion spot in the cylinder. It won't be clear til it's rebuilt what the root cause is.
I am also quite out of my depth of understanding of all this and am being guided by the paternal hand of @BRM.