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The four remaining celebrities fight for a place in the semi-finals.

Their first challenge is a relay invention test, and it's all about teamwork. Split into two teams, each team must create a main course and a pudding between them, using a whole cod for the main and chocolate for the pudding, as well as a range of fruit and vegetables, herbs and spices.

Each team member has 25 minutes to make their contribution to the dishes, but they can't communicate with one another, so each cook must try and work out what the dishes are meant to be from the clues left behind by their teammate, before continuing the work they've started. For the final 15 minutes, the team members come together to finish the dishes, but will the celebrities be able to create something successful?

The celebrities then remain in their teams and are sent out on their first mass catering challenge, where they have to make lunch for over 100 members of staff at Battersea Power Station.

With an array of ingredients including steak, kidneys, chicken as well as a range of fruit and vegetables, the two teams must devise, prepare and serve the lunch, catering for various tastes while creating meat based, vegetarian and dessert dishes in volume. In the heat of the kitchen, the celebrities will have to rely on teamwork skills as well as their culinary ones to triumph.