The best salmon, smoked haddock & king prawn fish pie

potato 40.0% , milk 25.0% , salmon 20.0% , smoked coloured haddock 10.0% , King Prawns 2.5% , double cream 1.3% , wheat flour 0.6% , extra mature cheddar 0.3% , white wine 0.2% , butter 0.1% , corn flour 0.0% , palm oil 0.0% , dijon mustard 0.0% , parmigiano reggiano 0.0% , salt 0.0% , parsley 0.0% , fish stock 0.0% , white pepper 0.0% , black pepper 0.0% , yeast 0.0%