Not one but TWO of David Walliams’ books have been turned into TV programmes. David will be turning himself into the evil Burt from Burt’s Burgers, who wants to turn Zoe’s rat into ‘delicious’ rat burgers and eat them. For Grandpa’s Great Escape, channel surf your way. Since beginning his publishing career in , David Walliams has taken the Previous bestsellers RATBURGER and GANGSTA GRANNY were also. Raj – From Demon Dentist, Grandpa's Great Escape, Ratburger, and fan- favourite Raj appears in (nearly) all of the David Walliams novels. The new show Ratburger from David Walliams is a highly anticipated treat for TV fans. Unfortunately this UK exclusive is not available outside. In between appearances on Britain's Got Talent and every panel show under the sun, David Walliams been steadily carving out a side job as a. This funny David Walliams book character Ratburger costume, includes a red and white striped top, trousers, messy wig, glasses and a special sauce prop. -.