Julian if didn't know already, their a/c was coded RA-D.
Have you tried the Public Archives of Canada? Chaz Bowyer in his Mosquito Squadron book has a couple of photos of 410 Mossies credited the the Archives.
A 410 website which might be of some help,
http://rcaf.com/439squadron/Toocon_e.htm (if you didn't know of it already)