@izzythepush,
I got this reply from someone on another site about this topic:
Don't assume that Wright's allegations were true
Reply to marble falls (Reply #1)
Fri Dec 29, 2023, 02:42 PM
Wright was, when it comes down to it, a borderline nutter, who wrote the book to extend his claims that most of MI5 had dismissed. Some think there could have been something in it; most do not.
https://en.wikipedia.org/wiki/Roger_Hollis"
My comment was that moles were a feature of the US, Russian and UK intelligence services at all times.