There was a TV show made in the 1980s called The End of Empire [0] which is (mostly) available on YouTube. It chronicles what happened in India, Palestine, Iran, Egypt, Cyprus, Ghana, Kenya, South Africa, Singapore etc. and may be of interest to those musing about Britain's decline.

I learned about it from watching Coup 53 [1].

[0] https://www.youtube.com/watch?v=D2WaMdGl0uw&list=PLanJEt7jLo...

[1] https://www.imdb.com/title/tt1984135