The eighth novel from number one0 bestselling author, David Walliams now available in paperback! Jack's Grandpa... wears his slippers to the supermarket serves up Spam a la Custard for dinner and often doesn't remember Jack's name but he can still take to the skies in a speeding Spitfire and save the day... An exquisite portrait of the bond between a small boy and his beloved grandpa, this book takes readers on an incredible journey with Spitfires over London and Great Escapes through the city in a high octane adventure full of comedy and heart. Illustrated by the award winning Tony Ross.