Unfortunately it looks like a total engine strip down and rebuild - new crankshaft and flywheel. Amazing that the engine was still running.
Bad luck.
Not only did the engine run but the clutch worked?! I pulled back and forth in gear with the engine running.
I feel it is beyond my capabilities to rebuild the engine and I couldnt afford to send it off to a specialist... I guess Id have to risk buying a 2nd Hand engine and seeing if I have better luck.