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Heat the oven to 220C/200C fan/gas 7. Tip the flour into a bowl and add some seasoning. Turn each cod fillet in the flour until evenly coated.
Heat half the oil in a non-stick frying pan over a medium-high heat. Add the cod and fry on each side for 2 mins or until golden brown.
Transfer the cod to a roasting tin. Arrange the lemon slices and thyme on and around the fish and drizzle with the remaining oil. Bake for 10 mins or until cooked through.