Thanks Kev, Simon. development today. Big up to John Hackett at JHP Coventry for donating a good used piston to me and offering me his hone for the barrel.
Measured the crank and rods and decided they were close enough to spec so polished the crankpin journal and fitted a new set of shells all seems good so far. Crankcase halves are back together, heads revamped and re shimed. I'm confident that it will last to end of season, should be running by the weekend.
Shall be on a mission to claim back some lost points at Cadwell, Andy Challis' friend had quite a good pic of the smoke bomb I would like to see it posted if possible.
So in summary I think I'm all sorted.