Ms Wiz Spells Trouble by Terence Blacker
"I go wherever magic is needed," said Ms Wiz. "Wherever things need livening up..." Things are certainly livened up at St Barnabas School when Class Three's new teacher arrives. She has a magic rat, a rather rude owl and some very special powers. But when Podge's dad is turned into a warthog and the School Inspector loses his trousers, Class Three has to admit - Ms Wiz spells trouble!