You could try the 22 Sdn.Association as they operated the aircraft at different units.I flew it quite a lot at Finningley,and it`s last flight on 17Dec.`81.
There is a picture on the 22Sdn website of it(possibly) when it was a WW Mk2,and built around 1955,with a P &W R-1340 radial.Later about 1960-ish it was converted to a Mk10 with the GE-T58(licence-built) deH/B-S/ R-R Gnome,so loved by `Engineers` like Zetec2....