When were the stoppers applied to flying gliders in cloud over the UK?
Launched out of Farnborough in the mid 50s and found a nice growing Cu. Up and Up until the unmistakeable noise of 4 engine/props persisted in coming closer. Straightened up and desperately wanted to get out of the cloud but not before a huge noise went swishing by accompanied by my big sigh of relief.
I'll bet that noisy thing didn't file a flight plan. Nor did I!!!