I am surprised that there has only been one mention of 631 VGS at RAF Sealand on this thread. I did my 3 solo's there in June 1967 in WV925, whilst a member of 611 Squadron (2nd City of Liverpool) ATC.
Great article in PILOT Dave, and I endorse everything positive that's been said about the ATC, and the shamefull lack of flying experience available to youngsters. My experience with the ATC engendered a lifetime interest in aviation, which continues to this day.