I did my RAF Gliding Scholarship there when i was 16. Me and a pal got a travel warrant to take us straight from annual camp at RAF Coltishall to Sealand, and we sat on the grass everyday getting the most horrendous sunburn. Geoff Addy was my instructor, quite a big chap and used to wallop students from his back seat in the viking. I also remember literally skimming the roof of those hangars on every approach and was amazed that we never hit them. The trick was to time the sudden sink as you passed the roof and the retraction of the spoilers. Came close to parking on it a couple of times.
His one phrase of "Bootfuls o' Rudder boy" has always stayed with me, although I had to unlearn that the following year for my Flying Scholarship.
Happy times, and I always raise a smile whenever i pass by. Completely unrecognisable now.