I was at RAF Changi 1964-1966 and remember the Britannias of BUA and British Eagle.The wife and I flew from Stansted in Jan 1964 with BUA calling at Istanbul (frozen to death)and Bombay(sweating like pigs),landing at Payar Lebar at 0630 one muggy morning with wife looking for snakes in puddles
We flew back to Heathrow with British Eagle in August 1966 calling at Colombo,Kuwait and Istanbul.
The first photo was taken at Payar Lebar just before we left.
The second was taken at Kuwait.The locals were refuelling the aircraft and saw me with the camera.An RAF Flight Lt who was in charge of the flight
knocked the camera away explaining that the locals might stop the job if I took a photo,that's why I only got half a Britannia.
If I remember correctly we had to wait for the temp to drop before we could take off for Istanbul.
I hope these are of interest,wish I'd taken more photos.