"Afternoon Tea" theme. It was revealed to the contestants that this Invention Test would take place in London. After settling in at the Langham Hotel, the contestants first challenge for the week was to invent a pastry, drawing inspiration from one of the Crown Jewels of the United Kingdom. Callum won the challenge and was rewarded with a private MasterClass with Jamie Oliver as well as attending the announcement of the World's 50 Best Restaurants with Matt Preston. Jonathan was chosen by Callum to share the reward. (thetvdb.com)