No more mercy – from the quarter-finals onwards, Marcus, Monica and even Gregg go in to ruthless mode, no longer willing to forgive the chefs for little mistakes or oversights. This is when the cooking gets serious, with the chefs having to work in teams in professional kitchens, come up with dishes from limited larders and push themselves under some seriously limiting time constraints. This can lead to a little sweating, lots of panicking and some colossal errors that can make or break a chef’s dreams of winning the show. Here’s what did and didn’t work last week.