Just to report that after removing the 5 units and given them a good clean using Merr polish on the lens I managed to improve their condition. I did contact Mark at Melvyn Rutter's who did not have any used ones in stock. I also asked about a replacement alternator for the car but alas he informed me that a similar plus 4 had to have their unit sent back to them to be rebuilt and they did not have this unit in stock.
Another thing was I tried to get a new oil filter from my local moto factors to find the cars registration was not on their computer system. I tried another larger company with no joy until I suggested he try 1990 Rover 820 Si . This came up with no problem as our Morgan used the same engine. For those with this M16 twin cam unit the filter is MANN W713/28 which had the important none return valve for OHC engines to prevent oil back draining from the cams and hydraulic tappets .I am not sure about the T16 engine.
Now to find a local company to have a look at the alternator. Thanks to all who replied.
