Director Paul King has explained how casting Hugh Grant as the iconic miniature creature of the Oompa Loompa in 'Wonka' was the key to his adaptation of the classic Roald Dahl character.

"Going back to the book, and reading all those poems, and hearing (the Oompa Loompas') voice as a very sort of cynical, sarcastic, cruel, funny, but wicked voice, I went, 'Oh... That's sort of a bit like Hugh!'," King told Empire magazine ahead of the trailer launch.