Danny: The reference here is to the notorious "Doolally Tap": Deolali was a transit camp near Bombay, often troops immured there were said to go bonkers from a mixture of heat, boredom and sunstroke, the word went into general use out there as "going Doolally".
Yes familiar with that. We had a wee Scottish fellow on our Bucc squadron who would always say "going Doolally", and had explained "Doolally tap" as going troppo up at the garrison outside of Bombay.
Imagine my surprise years later, when I was in a 'fast black' (actually a cream Ambassador/Oxford) on my way from Bombay to the MiG factory at Nasik when just prior to ETA, there I was at "Doolally". I guess that explains a lot about my subsequent behaviour...