I work in the school office of a smallish junior school. There are three of us - one full time and two of us part time (job share). I’m the newest to the team. The other two are very formal with parents, for example if calling a parent they’d say “Good morning, Mrs X? It’s Mrs Y here from Z Primary School”. Whereas I’d say “Hi, is that X’s mum? It’s firstname here from Z Primary School”. Last week on a rare occasion when the three of us were in the office at the same time (I think they were waiting to gang up on me!), the other two told me that I was too informal and should not use my first name with parents. I get on well with them and it wasn’t too awkward but I told them I disagreed and sort of laughed it off. But I’ve been stewing about it all over half term. Do I bow down to the school norm or do I dig my heels in? I’ve worked in a school office before where we used first names. I could I ask the Head I suppose?