Dennis,
Apologies for reopening an old thread but i was going through the RAF related ones and wondered whether you got any further with this?
The final photo shows a Tilly belonging to a station of 100 group. The two Halifax photos show machines of 192 Squadron, with one of them being MZ817 "Pete the Penguin":
https://www.iwm.org.uk/collections/i...at=photographs
192 Squadron were very interesting; one of the first ELINT squadrons, they would fly with the bomber stream and monitor the different frequencies for new radar equipment being used by the Germans. They also mapped out the extent of German radar coverage.
EDIT: I Knew had a few random months of 192 Sqn's ORB somewhere on my hard drive. I can confirm that J. A. McCaw was in 192 Squadron, at least in October 1944: