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@MrE
I've been ok running later 2-strokes - early 60s Sachs and Raleigh/Mobylette - but this seems remarkably crude by comparison.
Gaskets are ok and all is suitably tight - carb was stripped and cleaned a couple of weeks ago - exhaust expansion chamber has a surprisingly large through bore with a silly size slot in the end, which looks much the same as every other Trojan I can find pictures of, suggesting back pressure comes mainly from the manifold?
Fresh fuel might do it - never had problems before so I didn't give it much thought, just mixed from the can the other bikes use.
Thanks for your input - it would have been too much to hope that someone would reply with 'I've got one - you just need to adjust the ...'