Gill Meller's Smoky Fish Pie with Leeks Eggs and Parsley

Ingredients

• 500 – 800g side of natural smoked haddock
• 200g of whiting fillet skinned and cubed
• 180g of organic prawns
• 2 – 3 leeks, split, washed and thinly sliced
• 4 Stonegate Estate Organic eggs
• 125g butter
• 75g flour
• 400ml milk
• 150ml double cream
• 2 tsp of whole grain mustard
• Salt and pepper
• Small bunch of parsley
• 650g large white floury potatoes, peeled
• 50g of butter
• 100ml of milk
• 25g of grated cheddar cheese
• 25g of fresh white breadcrumbs