
I tried everything to get it going and finally removed it and stripped it down. The brushes were totally shot, two had worn completely away and the other two were very worn. In my efforts to start it I had connected a wire directly to the starter from the battery and that had resulted in burning the commutator. I had no choice but to buy a new one. A frantic search locally (I live in the middle of nowhere in the Lake District) found a local auto electrical engineers that could order me a new one for that afternoon. I picked it up and they said that it was a more modern design and when i fitted it the difference was amazing. The speed at which it spins my engine makes it sound like a "modern car".
If you are having problems try and take off the old starter and strip it down, it's quite easy to do and shouldn't take more than a few hours.
My new one costs about £100 with no need for the old one to be exchanged so I still have it in my garage somewhere.