Gavin McCrone himself is on record as saying that his briefing note was for a minister, but, in any case, its content was published in the 1970s by the Observer newspaper and was therefore in the public domain then.

Source: https://www.scotsman.com/news/opinion/letters/readers-letters-dont-botch-chance-to-make-sustainable-transition-to-net-zero-4354378

In November, the Observer newspaper that fewer than 2% of GCSE history students in England studied a module on the Middle East in 2020, and experts estimate that only 27 schools in England currently teach it.

Source: https://www.euronews.com/2023/11/20/censorship-and-safety-how-the-israel-hamas-war-is-affecting-students-at-schools-in-britain