...it does actually sound like v good value for money, if you happen to agree that it's really important for them to go overnight for bonding purposes - for 80 of them it's only £56 per night each & I can imagine a British hotel would cost a lot more than that even without flights.
However why couldn't they just have done it on-site? (Which they are doing now anyway, but the school will probably lose the £18 grand as well!!!. Mad.)
Why didn't they do it at the end of the school holidays instead of shutting the school for 2 days in term time? Will the head be disciplined? I am fascinated