What do you say about someone who has been as successful as Francesca Simon? Her Horrid Henry series is a huge hit with the children I teach and not only with the boys! The children are always surprised when they find her name on other books because for them she is synonymous with Horrid Henry. When you read the sales statistics on her website http://www.francescasimon.com you can't fail to be in awe.
If you haven't discovered Helping Hercules or Don't Cook Cinderella, two of her other novels for 7 to 10 year olds, they are well worth a look too. Where I work, Year 1 study fairytales and Year 2 Greek myths so these two books make good read-aloud serials while the unit of enquiry is underway or extension reading for the able readers.