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@mashton
I just picked up the MG from the garage after it having had the engine put back together. Lined and bored back upto 1860cc.
So, the good news is that it is back on the road, @brm and I can finalise the whole shebang and I can get on with enjoying it.
The bad news is that Fisher have no idea why it blew a hole in the piston in the first place. Their exhaust tests show it running the right mixture and no obvious mechanical culprits like brake servo leaks.
Not ideal as I would like to know a) why it happened and b) whether it will happen again.
Off to sanspeed on Tuesday for the rolling road and tuning to see if that sheds any light on it.
Mainly I want to investigate high rev running with lighter throttle, to simulate motorway booming, which is when it happened.
I hope it doesn't go bang again.