Heat the butter in a large saucepan. Tip in the bacon, then cook
until starting to brown. Add the onion, cook until soft, then pour over
the milk and stir through the potatoes. Bring to the boil, then simmer
for 5 mins.
Add the haddock, then leave to gently cook for another 10 mins. By
now the fish should have defrosted so you can break it into large
chunks. Stir through the sweetcorn, then cook for another few mins until
the fish is cooked through and the sweetcorn has defrosted. Scatter over
parsley, if using. Serve with plenty of crusty bread.