Update...
Just an update...
I removed the cylinder head today.
The plating looks to be in good condition, can't see the honing marks but also can't feel any lip at the top of the barrel where the rings/piston reach their highest point.
If I put my finger on top of the piston, I could rock the piston backwards and forwards quite a lot, seems excessive to me, so I assume the piston must be pretty worn.
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