The most likely 'culprit' would have been the Vickers Valetta, a 2-engined transport aircraft in wide use in the 50s, with 3 squadrons in Malaya/Singapore.
Checking through my copy of The Valetta by Bill Overton, published in 1996,Valetta VX490 on 48 Squadron's strength disappeared on 11/11/1953 on an air test and was thought to have broken up over the sea during a thunderstorm.
Hope this helps, BW