Put the potatoes in a pan and cover with water. Bring to the boil and simmer for 15 mins. Drain and mash with 25g of the low fat spread.
Put the milk in a large pan with the bay leaf, peppercorns and onion. Slowly bring to the boil and remove from heat. Remove and discard bay leaf, peppercorns and onion.
Put 50g low fat spread in a large pan and heat gently until melted. Add 50g plain flour and cook gently for 1 to 2 mins, stirring constantly. Remove from the heat and gradually whisk in reserved milk. Return to the heat and bring to the boil, whisking constantly until thickened.
Put the fish, skinned and cut into large chunks, in the base of an oven-proof dish, pour over the sauce and spoon the mashed potato over the top. Bake in a preheated oven at 190°C (gas mark 5) for 25 mins until potato is golden. Serve the fish pie immediately.
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