Didn't see it but its obvious the post office decline started when i retired 6 years ago,on a serious note i couldn't wait to finish after 34 years of thick managers who were promoted on seniorority rather than suitability.
I think the letters decline started when they started to let companys like TNT cherry pick letter delivery in big cities and letting them take the rural letters they didn't want to deliver back to royal mail to deliver for a pittance.