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The heats continue with the four remaining celebrities facing three more challenges. The first challenge is a knowledge and skills test, where the celebrities have to face John Torode and Gregg Wallace one at a time and identify a tray of ingredients, three spices and three leafy vegetables before being asked to make a lamb kofta, hummus and a flatbread from scratch in just 15 minutes.

The celebrities are then split into two teams and are sent out on their first mass-catering challenge, for which they have to make lunch for over 100 members of staff at the Francis Crick Institute, Europe's largest biomedical research facility. With an array of ingredients, including chicken breasts, salmon and beef mince as well as a range of fruit and vegetables, the two teams must devise, prepare and serve the lunch, catering for various tastes and creating meat-based, vegetarian and dessert dishes in volume.

The battle for a semi-final place then reaches its climax as the four celebrities must cook a faultless two-course meal that will not only be judged by John and Gregg but also by Celebrity MasterChef champions Ade Edmonson (2013), Emma Kennedy (2012) and Phil Vickery (2011).

Only the best two contestants can earn a semi-final place and come one step closer to winning the title of Celebrity MasterChef 2017.