One day the teachers, in their abundant wisdom, stood myself and a younger Witness in the corridor right outside the assembly hall where the children would filter past.
One day? We did that every day in our school, in both junior and high school.
I remember one day a woodworking teacher came past and told the teacher "guarding" us that he needed us for a job. When we got to the woodworking room he told us he didn't really and we could just mess about - "has to be better than listening to that assembly crap eh lads?!". Top teacher.
Nothing about the flag ever came up that I can remember. I doubt any of the kids would know what to do, not just the JW ones. It just wasn't a thing.
I remember the Silver Jubilee though, I was in junior school at the time and we all got a commemorative coin. I wonder how many still exist and whether they are valued enough to buy a mars-bar, a packet of crisps and a can of pop? ... which is what I think I did with mine on the way home :)