Thanks to all that helped me directly with answers and parts and indirectly with historical posts.
I have (for the first time ever) took an engine apart, down to the base gasket, and cleaned stuff I didn't know was in there, then put it all back together again and I still have a bike that works. Totally impressed with myself and equally thankful for the help and information available in the forum. I may even have enough knowledge to answer question in future.
I would go out on a test run but it is a bit on the pouring with rain side so I will go tomorrow.
ThanksKenny m