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Cover the potatoes in cold water, bring to the boil, then turn to a simmer. Cook for 10 mins until tender, adding peas for the final min of cooking. Drain and roughly crush together, adding plenty of seasoning and 1 tbsp oil. Keep warm.
Meanwhile, for the dressing, mix 1 tbsp oil, the lemon juice and zest, capers and chives with some seasoning.
Dust the fish in the flour, tapping off any excess and season. Heat remaining oil in a non-stick frying pan. Fry the fish for 2-3 mins on each side until cooked, then add the dressing and warm through. Serve with the crush and broccoli.