Preheat oven to 200°C, gas mark 6.
Place the potatoes in a large bowl and add the olive oil and rub it all over.
Place them with the 2 whole sea bass on a baking tray, spray with oil and season with salt.
Meanwhile, mix all of the ingredients for the dressing together in a bowl and whisk until incorporated.
Add the dressing, garlic, bay leaves and anchovy flakes to the pan. Drizzle them over the fish and potatoes.
Bake for 30 minutes, turning halfway through, until starting to become golden on the underside.
Serving Suggestions: Lightly roast some asparagus at the same time, and serve with the dish for a nice contrast in flavour to the fish.