In Britain, we like to think of ourselves as a nation of foodies But many people don't know what good quality produce looks, tastes, or smells like, or where it comes from. Across the UK there is a cornucopia of wholesale food markets, fishmongers, greengrocers and specialist food suppliers, where seasoned merchants and traders use knowledge acquired over generations to ensure their customers get the very best produce. The show has trawled the country to get Britain's top fish experts to reveal their secrets from the deep. Award-winning chip shop chef Mark Petrou shows how to fry up the perfect fish and chips - with Prosecco. Billingsgate pro CJ sniffs out the freshest fish. Michelin-starred seafood guru Shaun Rankin cooks up a fishy dishy with wow factor. And renowned fish restaurateur Nathan Outlaw reveals how to feed the whole family on the cheap.