IMO, the wheels fell off decades before I was born.
The peak of the empire was around WW1, where the victory was immediately followed by Irish home rule, and Churchill(!) putting the UK military into austerity to save money, which is how it came to be that evacuating from Dunkirk involved a lot of civilian ships, amongst other things: https://en.wikipedia.org/wiki/Ten_Year_Rule
I'm not sure the people of the UK have yet fully internalised this decline, given the things said and written during the Brexit process. Perhaps social media really did make it all worse, but it's been authoritarian, chauvinistic (both internationally with imperialism and domestically via the aristocracy), and theocratic, ever since Harold Godwinson may or may not have taken an arrow to the eyeball.
The peak of the empire was around WW1, where the victory was immediately followed by Irish home rule, and Churchill(!) putting the UK military into austerity to save money, which is how it came to be that evacuating from Dunkirk involved a lot of civilian ships, amongst other things: https://en.wikipedia.org/wiki/Ten_Year_Rule
WW2 was a Pyrrhic victory. Not that Westminster collectively realised the nation's weakness until the Suez Crisis and the Wind of Change: https://en.wikipedia.org/wiki/Wind_of_Change_(speech)
I'm not sure the people of the UK have yet fully internalised this decline, given the things said and written during the Brexit process. Perhaps social media really did make it all worse, but it's been authoritarian, chauvinistic (both internationally with imperialism and domestically via the aristocracy), and theocratic, ever since Harold Godwinson may or may not have taken an arrow to the eyeball.