This is a silly question but it's my first job. 
Do I need to call or email work/my manager to let them know I'll be absent as I'll be on annual leave?
I've gone through the formal process of applying and being approved my annual leave so it is on the rota that I'm on annual leave. However, do I also need to phone/email in to remind them that I'll be absent as I would if I was unwell?
Thank you