We haven't come across this before (3rd primary school as we're a forces family) but this year we have been as asked to buy homework books for the children. They only cost a couple of £s each but they don't get the books until we've paid and this week a couple of children (not mine) got detention for not doing their maths homework - because the money hadn't been sent in and so they hadn't got their book!
Somehow this just seems like a funny way to approach homework. Does anyone else have a similar system at their school?