<p>To celebrate his tenth birthday the whole Humphrey series has a smart new livery, repositioning him alongside perennial favourites such as Winnie-the-Pooh and Paddington.<br><br><br>When Humphrey's teacher, Mrs Brisbane, doesn't come to school, he is unsqueakably worried. Then a supply teacher, the mysterious Mr E, arrives and everything changes. Class is fun, but are Humphrey's classmates learning anything? And what had happene...