Firstly, place the fish, bayleaf, peppercorns in an ovenproof casserole and cover with the milk. Bake in a moderate oven for 20-30 mins or until the fish is just cooked, but not overcooked. Remove to cook and flake the fish in medium sized chunks when cool enough to handle. Meanwhile, add the leek and potatoes to a stock pot and cook in a little oil until the leek has softened. Next add the sweetcorn and enough hot chicken stock to only just cover the veg. You want the potatoes to cook through so they are tender but not falling apart. When they are tender, add the milk from the fish (without the peppercorns, bayleaf and onion) and the flaked fish. Serve piping hot. Also nice with some king prawns and petit poi peas.