That may be illegal showing Pyjamas to 11 year olds KatyK because it has a 12 classification (still too young imo). Parents should take this up with the school, it's certainly not appropriate. What on earth are they thinking? I think you have to keep a careful watch on what they do in schools these days, what they teach them and what they show them.
The other thing they are showing in schools is They Shall Not Grow Old, the colourised footage from WW1 which is shocking, amazing, but unmissable for adults and maybe 16 plus age group. Definitely not for the younger ones, but one can only wonder what age they are showing that.