I'm in Scotland, btw, but I know there is a similar problem in England.
My DD's school is really understaffed. The P1 teachers have both been off all week, which has caused absolute havoc. They have had different teachers for mornings and afternoons because there are also no supply teachers available. P7 had to be split up for a teacher to come and take the little ones.
2 classroom assistants are also off on maternity leave, which either isn't or can't be covered. That's left 3 classroom assistants for around 300 children.
I know the school are doing their best. I've written to my MP and MSP. Is there anything else a concerned parent can actually do?