I just rang work to let them know that I was feeling better and would be back tomorrow. Bossman wasn't there, so I spoke to Old Secretary. I gave her my message and then wanted to confirm the time and class I'd be teaching - June is exam time and not only do our times change every week, we frequently have to sub for other teacher who are giving exams.
I asked her if my schedule still said 8:20 and which class I had. She got up to look, came back to the phone and said "You start work at either 8:20 or 8:30 and it doesn't say which class you'll be teaching."
Realising that further questions would be fruitless, I thanked her and hung up.
Let us not forget that OS is the one in charge of scheduling.