I just read Bill Dean's post and the quote from the BGA instructor's manual, to wit:

"As this training progresses, it is necessary to introduce brief spins where
the ground is noticeably close. This is to ensure that the trainee will
take the correct recovery action even when the nose is down and the ground
approaching. A very experienced instructor flying a docile two seater in
ideal conditions may be prepared to initiate a brief spin from 800'. A
less docile two seater with a less experienced instructor, or less than
ideal conditions, should raise the minimum height considerably."

Dumb.