Anyway I am sure we have many more examples of primary's schools that think this debate is relevant for children aged 10, and not a stupid debate.
It's not a debate. For it to be a debate, there would have to be valid evidence on both sides.
Besides, one school doing something has nothing to do with another school doing it. It's an uninformed false equivalency.
The shape of the universe is something mathematicians, scientists, philosophers ,and curious people have wondered, and still wonder. Is it flat like a sphere?or negatively curved like a saddle ?or flat like a piece of paper.? shall we ask the children of kenninghall primary school? Why not?
First, every single bit of evidence points towards a flat universe. Second, from your "examples" of the shape of the universe, it's clear you don't grasp what flat, closed or open means in the context of the shape of the universe. Third, the students at kenninghall have no concept of physics or math involved. Why should you ask them? Their opinion would be uninformed and pointless.