I have noticed this a lot recently, instructors calling the controllers by their first names on the radio.
A couple of things I would like to know regarding this;
Do you call your local controller by their real name?
If you are a controller, do you mind someone using your first name?
Sorry if it seems a bit of a weird subject but it is something that has been niggling away at me for a while now and I would like to know what others here think.
(back to the dark room now...............)