Fancy Fish Pie - Carême Pastry

Ingredients

• 1 (375g packet) Carême All Butter Puff Pastry, defrosted
• 1 egg, lightly beaten, for glaze
• 1 leek (white part only), chopped finely
• 1 small bulb fennel, chopped finely & fronds reserved
• 1 carrot, peeled and chopped finely
• 1 medium potato, peeled and chopped finely
• 1 bay leaf
• 180g approx Harris skinless boneless hot smoked ocean trout fillet
• 180g approx Harris smoked cod fillet (check for bones)
• 180g approx Harris smoked mackerel fillets (check for bones)
• 1 litre milk
• 50g butter
• ¼ cup plain flour
• ½ cup finely grated strong cheddar
• 1 teaspoon finely chopped tarragon
• ¼ cup finely chopped flat leaf parsley
• 1 cup frozen peas
• Preheat oven to 220°C (200°C fan-forced).