Aye Mark,
Please PM me with your postal address. A CD with workshop manual 'burnt' on, can then be despatched.
As for oil? Any 10/40 designed for motorcycles, Halfrauds, Morris, Silkolene, etc. Being a cheapskate I was using a car 10/40, but when the clutch spins up as your about overtake

and the oncoming timber lorry crowds the gutter to allow three way working

, you do something about it. Wash all the clutch plates in brake cleaner, check plate thickness and spring lengths, re-assemble with care. Check cable for wear, lubricate and re-install with care. Finally, re-fill motor with correct grade of oil and hey presto, the clutch behaves as it should and grips!

My regards, Bill.