Timothy Knapman 
My Uncle Foulpest: Dinosaur Disaster [EPUB ebook] 

Wally has chicken-pox and is desperate not to miss his best friend’s birthday party — and Foulpest reckon he knows exactly how to make him better. Unfortunately, though his magic medicine gets rid of Wally’s spots, it has a surprise side-effect… Wally has grown a dinosaur’s tail. Desperate to get rid of the tail in time for the party, it’s off to the doctor, where much hilarity ensues… The second story in this volume features Wally’s school trip to a haunted house — where Uncle Foulpest helps exact revenge on the school bully, by fair means or foul…