Problem solved but its good news / bad news....
Bad news is that these starter motors were a special model built for Morgan in the 1990's and are not fitted to any other vehicle, I think the rotation is opposite to the ones used in the std Rover 800 T16 engines. Also this means that a Hi Torque one is not available off the shelf.
Slightly better news - Powerlite will build one if needed, though at a price..
Even slightly better news - they can of course be rebuilt.
Finally the good news - they are available off the shelf at the Morgan factory and no doubt through dealers. I called in there yesterday quoted the engine number and within 3 minutes I had a new one. I was told the factory modified them a little but didn't know how, I believe it to be a slightly and crudely (even by Morgan standards) modified and extended power connector on the solenoid.
So if you need one grab them whilst they are still around...