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This week sees the heats for north west England.

Competing for the top spot are Liverpudlian returner Dave Critchley, executive chef at fine dining Chinese restaurant Lu Ban, as well as three new chefs. They are Sam Lomas from Macclesfield, a former apprentice at Hugh Fearnley-Whittingstall鈥檚 River Cottage and head chef at Glebe House in Devon; Lancashire lad Stevie Lamb, head chef at the 4AA rosette hotel The Orangery in Darlington; and Brazilian-born Caroline Martins, who lives in Manchester and runs Brazilian British fusion cookery pop-ups.

Presenter Andi Oliver welcomes them to the kitchen, where the theme for this year鈥檚 competition is a celebration of 100 years of British broadcasting. One of the four must leave the competition at the end of the episode, to be decided by this week鈥檚 veteran judge - a previous winner who remains a surprise to the chefs until the moment they walk into the kitchen to taste the first course canapes.