Prof Pollock , of London 's Queen Mary University , made the claims in her book -- .
Prof Pollock , of London 's Queen Mary University , says there should be a tightening of rules to stop children being exposed to the risk of serious injury .
Prof Pollock , of London 's Queen Mary University , made the claims in her book -- and says there should be a tightening of rules to stop children being exposed to the risk of serious injury .