In the final heat show, the last five ambitious chefs plucked from kitchens across the country begin their bid to be crowned Professional MasterChef 2014 with three daunting tests. Their first challenge is the Signature Dish Test. The five chefs have one hour to cook one plate of food that showcases just what they can do. They must impress the judges from the off, because after this round one chef must leave the competition. The pressure mounts for the remaining four chefs with Monica's feared skills test. The chefs have just 15 minutes to prepare three canapes - one blini, one crostini and one vol-au-vent. Monica demonstrates how she would approach the test to the viewers, and then it's the turn of the professional chefs. With Monica scrutinising their every move, only those who hold their nerve will succeed. Finally, it's the chefs' last chance to impress as they face Marcus Wareing's Invention Test. Marcus demonstrates to viewers a beautiful crab dish, inspired by his early days in the kitchen as a young chef - crab-stuffed courgette flowers, chargrilled baby courgettes, baby artichokes, brown crab meat, chargrilled bread and sea herbs, served on a bed of aioli. Then, the chefs have to create a spectacular dish based on the same core ingredient. As well as the components of Marcus's dish, the professional chefs also have an array of other incredible ingredients to choose from. The four have just ten minutes to compose a crab-based dish and one hour to cook an inspired plate of food which will prove they deserve a place in the next round.