Uncover the secrets of Lindt, and the story of the Mars bar.

The documentary investigates the enduring appeal of Cadbury's Dairy Milk bar, while across the Channel, Belgian chocolate factory Guylian allows cameras to witness its production line for the first time. Plus, a look inside the Austrian headquarters of Josef Zotter, whose unique factory features a mini cable-car, an eccentrically inefficient chocolate robot and a cemetery for failed bars.

Behind the scenes at the largest chocolate shop on the planet - the London branch of M&M's World, finding out how the store copes with its annual 5.5 million visitors. Plus, a look at a Belgian chocolate factory that churns out 1,000 tons every day, and the work of independent chocolatier and baker Rose Dummer, who has been commissioned to create a chocolate version of Stonyhurst College to celebrate its 425th birthday.

A visit to the home of Toblerone in Switzerland, following the nougat-making process and discovering where the chocolate-maker's triangle obsession came from. Back in the UK, chocolatier extraordinaire Paul is on a mission. He wants to create a show-stopping chocolate sculpture depicting a barman pouring an everlasting bottle of rum to launch a new range of rum truffles - but the path to chocolate happiness doesn't always run smooth.

We enter Nestlé’s famous Kit Kat factory in York, a state-of-the-art facility built on the same site as the old Rowntree factory where Kit Kat began over 80 years ago.

Cameras follow the launch of the new confectionery department at Fortnum & Mason after a major refit. Plus, the history of Christmas chocolate packaging, and a behind-the-scenes look at the making of advent calendars stuffed with chocolate treats.