Schools are experiencing a recruitment crisis. Perhaps those who are criticising the OP should come and give it a go!
pp mentioned that in their LA (i think that's the term) the teachers are paid extra as part of their retention policy. Sounds like a good policy to me. You should be paid a fair day's wage for a fair day's work.
I'm not a teacher and i do roll my eyes at some of their posts here, but they are vital and we have a recruitment and retention crisis. That can be solved: with investment and so on. The more teachers push back on the extras (like monitoring ribbons on socks or use of jumpers 😜) the more chance there is that their profession will be properly arranged and properly compensated.
FWIW: i used to be in the army. On duty, literally, 24 hours a day. As an hourly rate our pay was shit (even though i was on the highest trade pay) but in the Army you accept that. I have subsequently worked in corporate jobs and where there has been (an often silent) expectation that i leave at insanely early hours and return at insanely late hours, i have said "nope, i will leave my house at the earliest at 7am and i will arrive home at the latest at 6 or 8pm and i will use hotels as necessary and fuck weekend travel unless there is TOIL or other benefit.
Often the other benefits have been (i used to do a lot of long haul travel for work) getting a weekend somewhere cool, or whatever, and that was OK for me, while i accept that other people would have preferred the early/late travel and no overnights.
And, lucky me, i have managed to work for companies that do appreciate my commitment (which is 100% - even on biz trips that could have been an email) and don't push it.