Smudge, I imagine you've seen this, but just in case ...
75(nz)squadron | About my father and the aircrews of 75(NZ) Squadron RAF
There's quite a bit about their groundcrew - including some mass photos etc, for instance ...
More information about 75(NZ) Squadron Ground Crew ? Christmas 1944. | 75(nz)squadron
Given that 75 moved to Mepal in June '43 and kept their Stirlings til April '44, there might be something useful among the many pages. LFH