Thanks for those, Kilwhang!
The HQ pictured is actually
FEAF (not NEAF) - I know because I was invited to a 'hats off' party there in 1970 (to give evidence) - not me sir!
The map also appeared in a Changi Informer magazine - remember those?. I don't recall ever being issued with a copy as we were expected to find 48 using our own initiatve and inbuilt nav skills!
Our youngest daughter was born in Changi Hospital and has both British and Singaporean birth certificates - we had to visit the British High Commission to acquire the former piece of paper.
Glad to hear that Changi Village still stands - happy memories