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More than 1,000 restaurants have a hygiene rating of zero and five million Brits get serious food poisoning every year, so chef April Jackson and food hygiene specialist Gareth Jones set out on a mission to clean up the nation's fast-food outlets. Gareth joins council food inspectors and discovers filth, dangerous levels of bacteria and evidence of rodent infestations, while he and April tackle a chip shop in Harrow, west London, in desperate need of a makeover, helping it to achieve a five-star hygiene rating.