Back on the road again... only took 7mths.
Top end re-built (including valve spring seats that were not fitted at last rebuild), new rings, bore honed after only an hour or so of running (it's amazing what happens when rings are put in upside down) oil pump replaced (thank you Muskrat) front wheel bearings replaced and brake cable attached with more than rust, re-built magneto and carb' overhaul new tyres and away she goes!
Now I have all the fun bits to deal with, gearbox oil leak at sprocket, leak at crankcase near filter (previous repair may have been done without dismantling engine) pinging! and a fantastic headlight that seems to only highlight the gold fleck in my front guard!
For now I am happy, an oil tray deals with the leaks, daily riding deals with wet sumping and daylight only use deals with the yellow glow that is my headlight.
Now I need to find an air filter that will fit in the tiny space available with my 376 Amal, I think some serious innovation may be required.