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It is the penultimate show, and the final four amateur cooks face the challenge of a lifetime cooking alongside internationally renowned chef Ashley Palmer-Watts. Regarded as a leading culinary innovator, Ashley has worked alongside one of Britain's most famous chefs, Heston Blumenthal, for the last 18 years.

As head chef at the three-Michelin-starred Fat Duck in Bray, Ashley helped create some of the world's most revered dishes before working with Heston to open London restaurant Dinner in 2011. Within months of opening, Dinner won a Michelin star and was awarded its second a year later.

Now the four finalists gain a unique insight into Ashley's cuisine as they learn directly from him and his head chef Jonny Glass in the MasterChef kitchen. Each amateur cook has five hours to recreate an iconic dish from Ashley's menu at Dinner, and some of Dinner's recipes have as many as 120 stages of preparation.

Once the four finalists have prepared their complex and precise dishes, they must serve them to Ashley and to judges John Torode and Gregg Wallace.

Finally the four amateurs are tasked with creating one exceptional dish for John and Gregg that showcases their growing cooking talent. Only three can make it through to the final.