Extreme Chocolate Makers

Today, it's all about the physics of chocolate in north Wales as Emma and Mark Baravelli attempt to create a chocolate replica of the Rutherford atomic model for the Nuclear Awards. When your clients are all experts in the field, the pressure is on to make sure everything's perfect. And that's also the case for Basingstoke's Laura Miller who has a special commission for a 90th birthday party. Her client is a lifelong friend who wants an allotment-themed surprise for her grandad.

There's a barrel of laughs in Scotland as Ruth Hinks pairs chocolate and beer for a new bar while Cornwall-based graphic designer turned chocolatier Nicky Grant creates a three-tiered chocolate extravaganza, complete with ruffles, flowers and hearts, for a surprise wedding gift.

The pressure is on as Cirencester-based Aggy Dadan takes on a double commission from the Croatian Embassy - a two-foot chocolate lady and a map of Croatia weighing in at over 14 kilos. With time limited to make everything before the embassy's party, can Aggy get all the details spot on and impress the Croatian ambassador himself? Meanwhile pastry chef turned chocolatier Paul Wayne Gregory is asked to cast a Chelsea pensioner's face in chocolate.