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[Andyr1953]

Could the problem be caused by crankcase pressure blowing into the primary case? Is your crankcase breather working correctly?

There is no crankcase breather fitted to the bike and it doesn't show one in the parts book

[Andyr1953]

Not just pressure blowing past the l/h crankcase seal, but oil too? Hopefully not, but on the Redditch Bullets of that era the oil seal (actually washers and a disc of felt) has to replaced from the INSIDE of the l/h crankcase if it fails, which means an engine strip. My '61 Bullet's engine is away having the l/h crankcase modified for a more modern garter seal which can be replaced from the outside, though it's also having a few other jobs done.
I am not losing any oil from the engine side just the oil from the clutch case it seems as the oil is flung from the chain it finds its way up the alternator wire have modified the wire to stop this but it doesn't solve the problem
A.