Thank you for replies, chaps. Most interesting reading.
Particularly pleased that our JP spin training saved at least one Lightning.
Not sure the F4 was recoverable, we understood at the time it went flat and was unrecoverable, although drag chute could possibly help.
Tales of the Vampire brought back a few memories. On my first spin in the T11 I was told to look at the booms flexing in the RV mirror. Never did again !
Thank you all, again.