I have WB935 in my logbook in March and May 1964, this was at RAF Spitalgate on 644GS although the aircraft may have belonged to No 1 Gliding Centre which I think has moved their for a time.
I assume that you have seen this thread:
Air Cadet Gliding pix in the 80s (pre glass) - PPRuNe Forums
Keep safe
TTWTDI