https://www.thetimes.co.uk/article/the-queen-warned-butler-to-beware-of-dark-forces-at-work-llkblq8cs62
http://news.bbc.co.uk/2/hi/uk/2407841.stm
https://www.standard.co.uk/news/diana-told-without-any-doubt-that-she-was-being-bugged-by-a-five-strong-surveillance-team-6645092.html