Smoked Haddock Melt in the Middle Fishcakes

haddock 24.0% , potato 18.0% , wheat flour 13.5% , bechamel sauce 9.0% , haddock 7.0% , water 5.5% , rapeseed oil 5.5% , White Extra Mature Cheddar Cheese 4.0% , potato flakes 2.3% , oat 2.0% , leek 1.6% , wheat starch 1.5% , salt 0.4% , white pepper 0.4% , parsley 0.4% , black pepper 0.4% , yeast 4.4%