Add half the milk and bay leaf, cover and cook on HIGH for 7 minutes, until it can be flaked.
Reserve cooking liquid.
Flake fish, discarding skin and bones.
Cut the beans into 2 1/2 cm pieces and the baby corn in half if large.
Place the butter in a microwave safe bowl cover and microwave on HIGH until melted.
Stir in the flour and whisk in the fish cooking liquid and the remaining milk, a little at a time, until mixture is smooth.
Mix the vegetables into the sauce.
Cover and cook on HIGH for 6 1/2 minutes, stir in fish and pepper to taste and cook for a further 2 minutes, until vegetables are cooked, stirring twice.