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Just to add a bit more....years ago, I worked somewhere where everyone was issued with identity badges. We were all Mr, Mrs, Miss or Ms - all except the caretaker! He was 'John'. He rightly complained and told the managers that if all the other men there were Mr., so was he! So using first names can be an unconscious way of saying 'you are lower in status to me'. I am very happy to be called by my first name by a consultant but I want to use his or her surname as a mark of respect for his or her status, but I'm not sure if my respect is taken this way. My consultant might think I'm stuffy and unfriendly.
Very occasionally, I might go out for a meal. My wife will put on a ice dress or top and a bit of 'bling' and I might wear a smart shirt. It gives it a sense of occasion, but everyone else is in jeans and T-shirts and trainers. I think the loss of formality is a bit sad. I wonder how long it will be before people dress casually for weddings and funerals. I fully expect it to happen.
So, I think it's a double-edged sword. I have noticed a very definite change of attitude in nurses and doctors. As a kid who fell off his bike, nurses were dismissive and rude and doctors hid behind white coats and were unfriendly and 'superior'. They are now so much more informal and friendly but with the disadvantage of sacrificing 'respect'....I'm still very confused about how to behave, dress and speak to people!