In the past year I have gone part time in a job I was previously full time in, and work Monday - Wednesday. I am studying on Thursdays and Fridays.
Last week, our manager sent an email on Wednesday evening, after I had finished work, asking for all leave requests from 1st April to 1st September, and that these would be dealt with on a first come / first served basis. As I wasn't then at work till Monday morning, I didn't email my requests till Monday afternoon (I had to check with my husband for some of it, as we try and cover as much school holiday child care as we can between us).
We had a week away in Spain booked for summer 2020 which we moved to 2021, and then had to move again to 2022. It's paid for, and we have insurance that covers Covid.
Turns out, a colleague has requested the week the holiday has been moved to. It is in my calendar, and had been mentioned to my manager, but I hadn't formerly requested it as leave year doesn't start till 1st April.