Thanks for that, Coff.
We'll try the Tweet address; they certainly don't respond to letters!
Interesting they say "Four Chipmunks commenced service on 5 May 1957" - I have WD287 (became the RMAF's FM1022) allocated to the MAAF on 15 Feb 1957, and the RMAF ended up with seven Chipmunks, all of which came from the MAAF.