Well, there is a particular way of dealing with people that is just ingrained in certain classes.
A well placed "Interesting", pronounced in a certain way, makes quite clear where they thought your place was. British people can with a simple "Good Morning" indicate exactly that they think you were an idiot without you getting any chance of doing anything about it .. unless you respond in equal measures. It is all about pronunciation! Unfortunately, I cannot get that across in writing.
But to give a practical example, I once sat in my old company's finance department. Our accountant was a beginning fifties core-middle-class woman (think Mrs McGonagal in Harry Potter) . She was phoning up companies who had not paid their bills. Being very friendly and kind, she was able to convey the message "you should be ashamed you sorry sod of a person for not doing your work and giving me silly excuses". After the first call, I said to her that I would be scared into paying now...
As for Jamie's protection work. Police Officer may do overtime, but they are employees like everyone else, so they will have shifts. Also, in Close Protection being too close to a principal is not desired.