I am due to return to work in two months on a part time basis (50% of my previous hours/ I will work only in the mornings). Before my maternity leave I worked full time and I have 20 days of leave left from 2022 as well as 30 days for 2023. I was convinced that the days that were accrued while I was still in a full time role would count as "full days" and as a result allow me to take two half days/ mornings off for each of them. My employer is now saying however that as a result of me returning part time, I will only be able to take half a day for each day I built up. Is he allowed to do this? It seems rather unfair to me and I feel I should have been made aware of this before I went on mat leave as I would have taken all my 2022 allowance before having my DD. I didn't find any information online so any insights would be much appreciated.