Celebrities compete in a contest of culinary skill. The first week of heats continues as the four remaining celebrities face three more culinary challenges, battling for a place in the semi-finals. The first challenge is a relay invention test. Split into two teams, each team must create a main course and a pudding between them. Each team member has 30 minutes to make their contribution to the dishes, but they can't communicate with one another. Next, the teams are sent out on their first mass catering challenge. They have to make lunch for over 100 members of staff at Legoland in Windsor. The two teams must devise, prepare and serve the lunch, catering for various tastes while creating meat-based, vegetarian and dessert dishes in volume. As the battle for a semi-final place reaches its climax, the four celebrities must now cook a faultless two-course meal that will not only be judged by John and Gregg, but also by past Celebrity MasterChef champions.