ORAC, fascinating reading the Sea Vixen Pilot's Notes you provided the link to earlier.
Slightly off thread but is raises the question who was L. T. Dunnett ? His signature is on the first paper page of the notes in the ring binder.
I did a quick 'google' and he also released other Manuals: Seamanship and Mathematics etc.
I recall that JSP 318 as late as the mid 1980s had his signature too.
What was L T Dunnett's position in MOD PE ? Is he (or she) still alive and has a tale to tell about the responsibility of releasing all these important documents ?