Luxury Fish Pie

Heat the oven to 200°C (180° fan) 400°F gas 6. Grease a pie dish.

Put the potatoes in a large pan of boiling salted water and cook for 15-20 minutes, until tender.

Drain well and mash with a potato masher. Add 25g|1oz butter and season to taste with salt and pepper

Pour the milk into a wide pan and add the fish fillets and prawns. Heat gently for 3-4 minutes until the fish is just cooked through. Remove the fish and prawns and strain the milk into a jug.

Melt the remaining butter in a pan and add the leeks. Cook until the leeks are soft, then stir in the flour. Cook for 1 minute, then gradually stir in the reserved milk. Cook, stirring, for 5 minutes, until the sauce thickens. Stir in the cream.

Stir in the parsley, then gently fold in the fish and prawns. Season to taste with salt and pepper.