Following a self depracating and niave question to Pete, the purveyor of the old warhorse, I paste his reply to me in full below.
I should add, SteveL, that you should receive the 'Observers Book of Motorcycles' for the initial observation. No doubt you'll now implement the mod, as will Andy230. Such is paddock life!
"Hi Bill, well done, you are absolutely correct! The best place to take air away is where there isn't too much oil ( middle of the crank). The air then goes through a labyrinth breather so any oil can drain back down into the crankcase.
Best regards, Pete"
I've thanked Pete for his sympathetic reply.
Off down sheet alley now. Bye Bye.