@glitterbag,
It's possible the events were not quite as Rbanks described them. Rbanks didn't get lunch detention with the tutor for burping, it was for being "rude" to the office lady who saw Rbanks come in a minute late. I wondered about the tutor thing too, but I think they might be part of the UK private school thing.
We have no idea if the school is run by Victorian standards or if Rbanks is embellishing. I've watched a whole lot of English comedies from the 50s and 60s, and the private schools in those flicks seemed to run according to how Rbanks says his school is run, so maybe that's the way it is.