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OK So pulled the back wheel checked and cleaned everything tensioned chain and tried again….No good! Did 5 days in France which was lovely but buzz noise persisted. On return I decided for the sake of 15 quid to replace the front sprocket….Ideally you replace both sprockets and chain at same time but as only done 4/5 k miles on these happy to make an exception and also just to see if things improved. When I compared the new to the old the old had indentations from the chain in the rubber damper. Maybe the chain was too tight or maybe it was a duff one. Good news on the test ride as now the buzzing is no more! I had fitted DID chain with JT sprockets this time but in future will pay the extra for the Yam parts. Happy riding

That is good news, Glad you got it sorted, I did say it's going to be something simple, sounds like different tolerances on the two sprockets causing the issue with chain. Thinking about it, I have a vague memory of something similar on one of my bikes in the long distance past that required a swap out of poorly machined parts, I don't recall the noise you describe but the solution was replace with a different sprocket to cure the problem. and well done for coming back with the end result. All too often there are multiple posts that remain unfinished with no conclusion or report back. I've given you another like on your last post there to help put you on the leaderboard.

Yes, it doesn't help that you've managed to get your handbag strap in the way either!