This looks fantastic, thank you for the recommendation!
(The epub you attached is corrupted, the chapters are blank.)
To add to the other Anon's post, End of Empire is a pretty good overview of the end of the british empire, and while not terribly detailed in any particular area, it gives a pretty thorough overview of the bush conflicts and dirty wars that made up the Empire's death rattle after the Second World War
Who would be the author for that?
The Decline and Fall of the British Empire by Piers Brendon might be better though, covers from Yorktown to the end