Sumps-The dear government at my present location won't let me view Flickr
However I suspect that's the photo of Graham Bishop et al..
When were you there? I suspect just before me- I started there in 81/82 I think, but flew as an AEG cadet before that, and went through to '87/88 I think.
There are more pics on the 621 website. I notice they're all called Squadrons now instead of Schools