Further to Old-Duffers post above.
'I am writing on behalf of Mrs X, my gran, to request the Record of Service of her late husband Cpl (fullnames) X who died on DDMMYY at RAF Changi'.
When writing include a photocopy of your gran's passport (the page with her photo) or perhaps better still, and if available, a copy of her marriage certificate.
This will speed up things considerably as well as establishing appropriate
bona-fides.
A couple of photos from my album of FEAF Valettas taken a couple of years later in 1958 at Gan as it was being built.
First is a FEAF Comms Sqn aircraft (48 sqn?) I think.
Second is a 52 Sqn aircraft as noted by the squadron flash on the fin.