You may want to try here:
http://www.nzdf.mil.nz/personnel-rec...-the-files.htm
Rex was killed after bailing out of Mosquito NF.XIII, HK399, JT-D. He was buried at Lyon-La Guillotière cemetery and then re-interred at La Douna national cemetary at Villeurbanne. The aircraft was shot down by flak on 2 July 1944.
Ed