As much add I don't particularly like Walliams, I hope his next book is titled "The tit Chef", or some such (Ratburger has already been taken) and is about a scrawny, self - opinionated hypochondriac, with a kitchen full of out-of-date tins and cartons but a secret cupboard stashed to the brim with Waitrose expensive non-essentials.
It could be a cautionary little tale of the perils and consequences of claiming to be far more qualified than one really is, while at the same time constantly having to swim furiously up-stream against a tide of injustice and victimisation.