The answer!
Hi, thought would follow up here with the issue re static timing spot on but dynamic not. I pulled the distributor and stripped fully. Reason became immediately apparent - counterweights and actuating pins heavily worn to the extent that the weights not only slop before coming onto spring tension - thereby immediately the distributor runs that it takes up this «*slack*» and throws timing out as experienced - but the pins are binding on the worn part of the weights and not then releasing the advance. In short, the advance stays on. Photo says it all I think. I have taken a complete distributor off one of my other three and will overhaul/check that one out - it cannot be much worse. As an aside, any source known for spares for these? Weights etc?
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