Smoked Haddock Chowder

Name: Smoked Haddock Chowder
Ingredients: 300 full-fat milk; 400 water (roughly); 10 g fish stock cube; 10 g chicken stock cube; 400 g natural smoked haddock ((roughly) filleted on the skin); 2 large potatoes (peeled and cut into 2cm pieces); 2 large onions (peeled and finely chopped); 3 garlic cloves (peeled and chopped); 1 tbsp anchovy essence (optional); 2 tbsp plain flour; 2 tbsp soft butter (heaped); salt and freshly ground black pepper; 4 tbsp chopped fresh parsley; 200 g good quality sweetcorn (well drained); 100 double cream (optional)