Smoked Haddock & Bacon Gratin

water 27.0% , potato 19.5% , sweet potato 12.0% , haddock 11.0% , semi-skimmed milk 8.0% , sweetcorn 5.0% , broccoli 5.0% , cheddar 4.5% , coley 4.0% , single cream 2.0% , onion 1.0% , Plain Wheat Flour 0.5% , salted butter 0.3% , rapeseed oil 0.1% , streaky bacon 0.1% , fish stock 0.0% , concentrated lemon juice 0.0% , red chili pepper 0.0% , paprika 0.0% , thyme 0.0% , salt 0.0% , white pepper 0.0%