M&S Gastropub Fish & Chips Main for Two Responsibly sourced Scottish haddock in a light ale batter with minted pea puree, chips and batter scraps. Serves 2. Oven cook the fish and chips for 25 minutes and warm the peas in the microwave for 1 minute. Recreate that Gastropub experience at home with restaurant quality classics from M&S, for the ultimate night in.