I started an admin role in Higher Education at Easter almost 2 years ago working across 3 departments. At the beginning of Michelmas Term, one department took on a lot of extra work and at Chrismas 2021 I began working exclusively for them.
My role and level of responsibility changed, and at my appraisal at the start of December 2022 I asked for the banding to be reviewed and wrote an updated job description. This is still under review.
The workload has increased and the department are recruiting someone to share the role (I will do 3 days and they will do 2 days). Of course they've advertised the job at the higher band that I was asking for using the JD I wrote.
I suspect that they will put me on the higher banding from this month. Would it be unreasonable of me to ask for this to be backdated to December 2022 when I originally asked? Bearing in mind that I'd already been doing the role for a year before that.