Hi Pete,
Thanks for your detailed reply.
As I need to replace the clutch side engine case gasket because of an oil leak from here (as well as the one from the cylinder head core plug!), so I will take the opportunity to replace the three parts of the oil check valve while I am there.
I will try to remember to post back whether this stops the oil level dropping about 20mm in the first few seconds after I turn the engine off.
Mark
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