I can't imagine anyone wanting to deprive children of the Harry Potter series. I think that if you've read the books then the movies should be open to you. My old school each had their techers read the first 2 bokks to children as young as 5, now those children are reading PoA, GoF, OotP and HBP, personally when I read CoS i was frwaked out by the snake in the walls, so if children are still chosing to read the books let them see the movies. The certificate hasn't been released here in London but it'll probably be a PG.
xxOumixx