Fish pie - cook pre assembled pie

[cherrypickles]

It's JO naked chef recipe.

I made the mash in advance so usually I top the pie with hot mash as per the recipe but this will be cold.

So raw fish, warm sauce and cold mash

How long should I add to the cooking time?

It's usually gas mark 7 for 35 mins iirc

I would have thought that was long enough to warm the mash through. 40 minutes on 5 is what I would do for cottage or fish pie from cold. - I cook my fish first so don't need to worry about that.

The sauce is hot, so it's unlikely to affect the cooking of the fish.

Thanks @merryhouse

It usually too hot to eat!

I'll get the fish and mash out of the fridge to come up to temp.

I never cook the fish first . 35-40 minutes always cooks it.