BFTS, Linton '83. As studes we had to spend an 'hour in the tower' each month to familiarise ourselves with ATC. I duly 'plugged in' to an attractive WRAF on radar to hear what was going on.
She was passed a departing Lightning from tower.
Attractive WRAF "Morning Punchy One (I made up the cs coz I can't remember the real one any more) call passing FL 70"
Lightning "Passing FL 220, do you want me to descend?"
"Negative, state direction of departure"
"Straight up."
"Request destination."
"Binbrook."
"Would you like clearance through Blue 4?" (old airways nomenclature for younger readers)
"Negative, going over the top."
"Roger, request ETA for Binbrook."
"5 minutes. QSY Binbrook Approach."
And that was that. I think we both learned quite a lot about the performance of the Lightning in that 15 seconds!