Overview: It is the semi-finals. With only eight professional chefs remaining in the competition, each pair of winners from the quarter-finals will compete for a place in the last four. The two winners from the second quarter-final battle it out head to head. First they have to cook at the one Michelin-starred Roussillon in London's Pimlico, under chef Alexis Gaultier. Then they have to create two perfect dishes in the MasterChef kitchen - only one can go through.