1) Peanut butter is A-OK in Britain. No one's life is about to be jeopardized if anyone brings anything with nuts to school--there are no nut allergies here.
2) The schools I've been in typically have an assembly for fifteen minutes every morning. This assembly is intended to pump school spirit by regularly honouring students or classes who have achieved commendable things (e.g. best attendance, best effort at keeping math notebooks neat, this morning it was the Year 6--who are the oldest group in the school--Prefects who had been chosen to take on a responsible role on the playground being given badges and notebooks, and whatever other criterion the head teachers--e.g. principals--decide upon). Sometimes classes will be responsible to present something they've been learning to the rest of the school, and sometimes head teachers will expound upon some character development theme, such as how to be a good friend.
3) In several schools, these assemblies opened and closed with classical music to bring everyone in and send them out. I heard Schubert's string quartet, The Trout one morning, and a Haydn symphony another morning.
4) Children as old as eight and nine years old (I'm not sure about the 11-year olds since I haven't taught the oldest two years yet) change in the classroom en mass for P.E. Boys and girls change beside each other without thinking about it.
5) Teachers are not responsible to supervise children who are eating their lunch. The "lunch ladies" who serve a hot meal to those who wish for it supervise the children inside the lunch hall.
6) The Brits prefer the "horseshoe" model for classroom layout. The teacher's desk is in the front corner (left or right) and the children's desks (or rather, tables) are set up in a semi-circle facing the front. Each classroom is equipped with a computer, data projector and visualizer. For the uninitiated, a visualizer is like a digital version of an overhead projector that can be easily zoomed in and out without getting blurry, and you can do other things like use the "mirrror" function to flip and image. This also allows teachers to easily show video clips off the internet in a way that would be the envy of most Canadian teachers at this point. Smartboards (or interactive white boards) have been rejected by the education system here because the visualizer is easier for the teacher to use and still be looking at the children.