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Thanks K2-K6, I have some spare condenser’s that I can try, it certainly sounded like something terminal. Any gotchas to fitting condenser’s?
I had exactly the same problem a few years ago. It was not long after I had replaced the complete points back plate with a nice new fully fitted out pattern one. First failure was miles from home, the very nice RAC man was familiar with these bikes and diagnosed a faulty coil, and we travelled back home on his lorry. New coils fitted, problem re-occured about a month later, so like you I removed the points cover and ran the engine and it looked like firework night. Still had the original 1976 backplate which was re-fitted along with two sets of genuine(expensive) points. No more problems! PS the condensers are the original factory fittings, 47 years ago, the other problem with the pattern plate was difficulty in trying to get the correct timing for both sets of points. Try and stick with originals if at all possible. Have fun. Mike.