Over the next two nights the heat intensifies as the remaining twelve contestants are split into two groups and get their first taste of a professional kitchen when they have to run an entire lunchtime service. In this episode the first group head to Eneko in Covent Garden, London. Spanish chef Eneko Atxa's second restaurant, Eneko, specialises in Basque cuisine and is led by head chef Javi Blanco, who helped launch it in 2016. During a busy lunch service, the six amateur cooks are entirely responsible for serving the restaurant's menu to paying customers. Who will buckle under the intense pressure as they cook in a demanding and totally new environment? Then it is back to MasterChef HQ for an invention test for John and Gregg. In a bid to stay in the competition, each cook has to show they have learned from their experience and can create a unique and outstanding dish worthy of gracing the table of a restaurant. The contestants also discover that they not only have to present their food to John and Gregg but also to renowned fish chef and two Michelin-starred Nathan Outlaw, who has picked his favourite ingredients which the contestants must cook with. After this challenge, one of them is sent home. Only the best five make it through to Friday's challenge - the gateway to the semi-finals.