The first challenge is the new Pairs Challenge, where the four celebrities are split into two teams of two, and each team is tasked with cooking the same dish. Both plates must be identical in both appearance and flavour, but there is a catch. In-between each pair there is a wall. The only way for the celebrities to successfully produce identical plates is by communicating with their team mate through the wall. The celebrities are then sent out on their first mass-catering challenge. Remaining in their teams they have to make lunch for over 100 members of staff at the famous Tilbury Docks, the largest port on the River Thames. Then it’s back to MasterChef headquarters as the battle for a semi-final place reaches its climax. The four celebrities must now cook a two-course meal that that is judged by John and Gregg, as well as by former champions Emma Kennedy and Sophie Thompson, and finalist Sam Nixon. Only the best two contestants can earn a semi-final place.