V impressed on the maths challenge!
Re trips @mojobrojo pretty much the same for both my DDs. DD1 had NO trips - Covid...and DD2, has, since she moved schools, managed one to Greece for drama. It was a total treat trip (she was doing GCSE but was never going to continue it) but I'd felt sorry for her having none.
The school ski trip has just been cancelled for lack of interest and there was no way we could have afforded most of the others (Sierra Leone, Madagascar, etc...). Her old school never offered expensive trips because there is no way anyone would have afforded them.
To make up for schools lack we tried to book other teen type trips. They both did PGL with our saved up childcare vouchers, then music residentials (ditto).
DD2 is home for half term - well I say home, we've been away to see her big sis at uni, so have explored beautiful Wales in the rain. She's off to (another) orchestra residential next wednesday after which she'll have to go straight back to school so we are making the most of it. Nice to hear her excited about various sixth form things - mainly the English Civil War and Chaucer. Neither things I can get very excited about to be honest, but each to their own!