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The first batch of five celebrities undertake three challenges to prove their talent.
Previous champions return to help decide who should go through to the semi-finals.
The second heat week sees five more celebrities face three culinary challenges.
The heat's four remaining celebrities fight for two semi-final places.
The third heat begins, with five more celebrities taking on three challenges.
2016 champion Alexis Conran is among those returning to help with the judging.
The final five celebrities face three culinary challenges as the last heat begins.
The battle for the last two semi-final places reaches its climax.