Which Witch?

Arriman the Awful Wizard of the North is tired of being the most evil wizardin the world. He decides he must get married and produce a son to take overfrom him.... » 

Arriman the Awful Wizard of the North is tired of being the most evil wizardin the world. He decides he must get married and produce a son to take overfrom him. His wife must be an enchantress of the darkest powers and witchesgalore enter his spellcasting competition. Belladonna has no chance. Shes noteven hideous flowers spring up on her pillow as she sleeps and bats nesthappily in her hair. She longs to be a fiendish hag and win the competition but how? An outstandingly clever and funny childrens novel that was runnerupfor the Carnegie Medal. «