Nigella has some recipes that require smoked haddock. Unfortunately, in Australia, it can be hard to come by. Would it be possible to used hot-smoked trout instead? Thank you.
Smoked haddock and smoked cod are popular in the UK and can be found in some other places at good fishmongers (in the US smoked haddock is called "finnan haddie"). However it can be difficult to find in many countries for recipes such as Nigella's Nursery Fish Pie (From Feast and on the Nigella website).
You can use an alternative such as hot smoked trout or hot smoked salmon as these flake (rather than the smoked salmon that you slice thinly). These fish are cooked and ready to eat whereas smoked haddock needs to be cooked before eating. So if you are substituting smoked trout you do not need to cook the fish before using it in the dish. For a fish pie you would poach the haddock (or other white fish) in the milk and make the white (bechamel) sauce and then fold the cooked haddock and the smoked trout into the sauce bafore topping with the potato.