Inside Cadbury: Chocolate Secrets Unwrapped (2019)

This one-off documentary goes deep inside the Willie Wonka world of Cadbury, Britain's biggest and best-loved chocolate maker. Behind closed doors at the famous Bournville plant, a team of dedicated scientists struggle to meet the biggest challenge the company's faced for a century - to dramatically cut sugar from their Dairy Milk recipe. Meanwhile, the firm's Easter Creme Egg campaign finds Cadbury agents 'reverse shoplifting' as they hide prize-winning white eggs around the country. Elsewhere in the factory new flavours of chocolate are put into production, with wacky recipes invented by lucky members of the public.

Unfortunately the movie Inside Cadbury: Chocolate Secrets Unwrapped is not yet available on HBO Max.