Heat one: Culinary novices Donna Air, Tupele Dorgu and Kelvin MacKenzie go head to head in the kitchen to cook for Olympic stars and restaurant punters
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Heat two: Celebrity chefs Ruth Langsford, Elen Rives and Mark Watson roll up their sleeves in a bid to impress Marco in the kitchen
Nancy Dell'Olio takes her place in the kitchen for heat three of the show - but how will she get on with master chef Marco?
Heat Four: Watch Russell Grant, Alex Ferns and Carol Smillie put on their aprons and are let loose on a busy London restaurant. Who will impress Marco?
It's the first sizzling semi-final and Alex Ferns, Tupele Dorgu, Ruth Langsford and Nancy Dell'Olio battle for a place in the grand finale
In the second semi-final, Elen Rives, Donna Air, Russell Grant and Debra Stephenson compete for a coveted place in the final as they cook Marco's lobster salad