interpretrix
What is the point of this?
I was a UK PC, and to be honest, neither I, nor many of those I worked with gave a toss what the Mil equivilent rank was. It's irrelevent. It matters not.
In relation to incidents where the Mil provide aid to civilain power, then senior Police Officer on scene is in charge, no matter what rank he is, and no matter what rank the senior Mil officer is, and yes, that can mean a PC running the show and an Air MArshall doing what he's told. So your comparison means nothing at all.
Pay. RAFP/RMP/Navy Regs do not do the same job as civvie Police, they don't have the same responsibility, they don't have the same decision making devolved to them. So yes, they are paid less, then again so are Mil pilots, ATCO', Aircraft Engineers and most other trades, when compared to Civilians.
Oh and you quote the Commisioner Of Police of the Metropolis in your pay scales for Police Officers, he isn't a Police Officer, he's a JP.