It’s interesting wording.
One of my DC has a school trip coming up. It’s an educational trip based around this terms classroom topics. It’s the sort of trip that’s not essential but that will enhance learning.
The letter basically says “The class will be going on an educational trip to xxx on date, the cost is £x per child, to be paid before the trip, any questions contact the school”
They don’t use the words mandatory trip or mandatory payments anywhere, but nothing about the trip or the payment suggests that either is voluntary on the part of the family.
Although it’s not like they can force people to pay. I suppose they could leave children behind if their parents don’t pay, or even cancel the trip if not enough people pay?
Having said that, I know they’re providing free pack lunches on the trip for children who qualify for free school meals, so I suspect that although they haven’t said so, they’re prepared to cover the cost for families who really can’t afford it.
We can afford the payment, so we have paid it.