Solved. The seals between the crankcase, clutch and gearbox were all leaking, and the clutch was worn out. The symptoms were a bit confusing though, as there was no slippage in lower gears.
All fixed by Andrew Sexton, along with the carbs cleaned and balanced and ££££££ of other stuff. Now running well, although I have to get used to riding with a properly functioning clutch, which is a little harsh. I have a new friction plate, an oil resistant version from EBC.
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