For the sauce, melt the butter in a smallish saucepan and then stir in the flour. Cook for a minute or so over medium heat and then add the broth, whisking well to make a smooth sauce. Let it bubble up for a few minutes and then stir in the cream. Taste for salt and pepper (your broth will probably be seasoned already).
Cut the fish into large chunks of about
Meanwhile, boil the potatoes in salted water until soft. Heat the remaining butter in the milk. Drain the potatoes and mash them or pass them through a potato mill into a bowl. Beat in the rest of the butter and the warm milk and season, if necessary.
Arrange the mash in dollops just around the rim of the dish, then bake the pie for another 10 minutes or so, or until the mash is
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