Most school trips are reasonably priced, and infrequent.
Big school "holidays" are voluntary
Subject based foreign trips are a killer I have been told, none here yet.
The canteen food is very highly priced, I give my ds a fiver a week
, and a packed lunch each day.
We have to pay for an ipad
The locker key, I agree is a rip off...I resent the 25 pounds a year.
You will be asked for a few hundred quid from just about every sport he does, and be hassled by world challenge students, all voluntary of course, you will also be asked to pay an annual good will direct debit of a few hundred quid. You need a strong will power.
You will also have bus fares
Termly fees for cooking or dt project materials
Termly disco tickets
French comic subscriptions...don't bother, they are pretty awful
Oh and I don't know about billys, but rgs has different coloured jumpers for sports and music team/band members at 20 pounds.
Buy plastic wallets for all subjects...Amazon have patterned ones in sets of 5
Do not buy a new bag until he has decided the style everyone else has, if you do get a cheap one to start with.
Do not buy the school gym bag....they all look the same, how unhelpful is that!
Do not buy an expensive mouthguard if you anticipate he will get a brace soon and need a very expensive mouthguard.
Do not lose locker key spare, or bus pass!
Cannot think of much else
Edited....set of drawing pencils for art....You can buy them from "the works" in wycombe, and buy several memory sticks (they get nicked), and lots of printer cartridges.