Leftover chicken & ham pie

Ingredients

• 200g leftover Field & Flower roast Whole Chicken, skin removed and roughly torn
• 200g Field & Flower Wiltshire Roasted Ham Joint or leftover roast gammon, cut into 1cm pieces
• 25g butter
• 1 large onion, peeled and diced
• 1 leek, sliced into 1 cm rounds
• 200g leftover roast potatoes, roughly mashed
• 175g leftover green cooked vegetables (See Tip)
• 2 cloves garlic, peeled and crushed
• 2 tbsp plain flour
• 100ml white wine
• 200ml chicken stock, made with 1 stock cube
• 150ml crème fraiche
• 1 tbsp wholegrain mustard
• 375g sheet ready rolled puff pastry
• 1 medium egg, beaten