"Doolally Tap"
Taphappy,
Of course! It was that kind of "tap". I should have guessed that instead of going on about taps and barrels. No excuse with the time I spent in India, where everyone knew of the Deolali (Doolally) Tap (I think "Tap" referred to a slight case of sunstroke, which was supposed to make you "lightheaded" - or plain bonkers!)
Never mind, we'll soon have you in the air, and then the fun starts. Keep it up!
Danny.