Overview: John Torode and Gregg Wallace return to put more keen cooks to the test. The first six hopefuls take on a new challenge in which they prepare their Calling Card, a dish that represents who they are and showcases their talent. This is followed by the infamous Invention Test, in which there is now a choice of two boxes of ingredients, and the stakes are high because after that, two of the amateurs will be going home. The remaining four then replicate the conditions of restaurant service as they rustle up dinner for three discerning guests - 2005 MasterChef winner Thomasina Miers, 2008 winner James Nathan and 2010 finalist Alex Rushmer. It's then up to John and Gregg which two will advance to Friday's quarter-final