Tyro, yes I did those! Here is the bit about it from my book:
'The very first time I took to the air in an aerial machine on my own was actually an accident! On a barmy day in July 1961 on the playing fields of a well known Grammar School close to Bomber Command Headquarters I was catapulted into the atmosphere in the school single seat glider. Unfortunately, or fortunately, depending which way you look at it, the supervisor had omitted to fit the lift spoilers to the wing. Hence, rather unexpectedly, my primitive craft and I soared to the dizzy height of five feet, landing shortly afterwards on the First X1 cricket pitch, in the middle of an important match. Suffice to say, this did little to impress the team and the sight of a very young Bluntie being chased off the playing field by a horde of irate six formers waving cricket bats was a sight to behold. I can remember that auspicious event as if it were yesterday.'