For almost 200 years Cadbury had been the home of chocolate. Making a staggering 350 tonnes of milk chocolate a day. But it's far more than just a factory. From its very beginnings the company set out to change our country. Not just by giving a great taste to the nation, but like Willy Wonka's fictional creation, building a magical place for its employees to live, work and play in. But as we'll find out it's not all been a sweet story. Over the past 150 years the company's been rocked by scandal, its products spreading deadly Salmonella and the victim of one of the most hostile takeover bids in corporate history when it was poached by cheese maker Kraft

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.

When the best chocolate maker in the world distributes five cards, invite him to enter his factory, which no one has entered in a while, who will get the cards and what will happen there?

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