Put the coley and smoked haddock into a large pan and pour boiling water over just to cover. Simmer very gently for 10 minutes. Turn it all out into a clean sink and leave until the fish is cool enough to handle. Then remove skin and any bones. Flake the fish on to a plate and reserve.
Wash the spinach thoroughly and place in a saucepan – do not add any water. Cook gently until it colla