Keith,
In addition to Edmundson's claim on 19 Oct 44,
Air War for Burma shows him claiming a Ki 44 damaged on 24 Jan 45 flying Corsair II (JT528) coded T8L (1836 Sqn.)
There is a photo in
The Seafire by David Brown which shows five pilots of 834 Sqn., one of whom is said to be Edmundson. All five are also said to be New Zealanders.
As for 12 April 45, the thread below shows Sub-Lt. P. Hemingway credited with the Zero.
http://forum.12oclockhigh.net/showth...highlight=1834
Regards,
Tom