a few years back I did the 30 Sqn Memorial at Maleme in Crete. The memorial is shared between 30 and 33 Sqns and there were a bunch of old boys to accompany the current sqn members.
I was told by an old boy (during a few beers at the local bar) that 33 had no joint association but there were separate aircrew and ground crew groups. this was as a result of the defence of Maleme where the aircrew departed the fix in what ever was able to get into the air, and left the ground crew to defend the airfield from german paratroop attack. Not sure all the details.
web link is to the memorial on the 30 Sqn association website
30 Squadron RAF Memorials of Past Campaigns and Incidents