Healthy fish pie

Ingredients

• Freshly ground black pepper
• 30g (1oz) sunflower spread
• 50g (2oz) frozen peas
• 30g (1oz) plain flour
• 2 tbsp fresh parsley chopped
• 1 large potato or two smaller ones (about 250g or 9oz total) peeled and diced
• ½ small butternut squash peeled seeds removed and diced; or 200g (7oz) sweet potato peeled and diced
• 300ml (½ pint) skimmed milk
• 1 medium-sized leek peeled and thinly sliced (about ½ cm or ¼ inch)
• 100g (4oz) broccoli chopped into small florets
• 100g (4oz) cauliflower chopped into small florets
• 200g (7oz) cod fillet skinned and cubed
• 70g (3oz) peeled prawns
• 40g (1½oz) low-fat soft cheese