Judges John Torode and Gregg Wallace are back as the semi-finals continue and the seven remaining celebrity cooks are digging in as they edge closer to the Celebrity MasterChef title.Tonight, the celebrities are surprised by culinary icon, Dame Mary Berry. Their job is to recreate one of Mary's favourite and delicious signature classic recipes. They will have to master unfamiliar ingredients and techniques to impress the judges and Mary herself.Then, after cooking for culinary royalty, the celebrities have to cook a dish dedicated to Her Majesty the Queen in celebration of this year's Platinum Jubilee. No-one can afford to slip up as at the end of this challenge, one more celebrity will leave the competition.