Roald Dahl was someone whom the Twelfth Doctor claimed had an even darker sense of humour than himself, only on Tuesdays and Thursdays. (COMIC: The Hyperion Empire)
Behind the scenes
Charlie and the Chocolate Factory is among Dahl's works.
Cardiff-born Roald Dahl is, of course, the namesake of Roald Dahl Plass, a major location in the Doctor Who universe as the location of the Cardiff Rift and the Torchwood Three base.