Having just been at an appointment and been addressed by my first name without invitibg the person to do so, I felt a bit annoyed. Maybe it's my age group but I was brought up never to call adults by their first name unless expressely invited to do so. I've lost count of the number of times I've been in shops, banks, car showrooms etc. and staff will look at paperwork or whatever and instantly start referring to you by your first name. One occasion, just to give an example, was when I was buying a new mobile and had filled out a form - the 12 year old (well OK maybe 19 year old!) assistant then proceeded to pepper my first name around the conversation without so much as a by-your-leave.
Mind you, I remember my grandmother used to call her friends Mrs X or Miss Y so maybe that's going too far!! Am I just too old-fashioned (and unreasonable)?