M&S 4 Smoked Haddock Fillets Frozen Smoked over beech wood chips, these flaky dyed haddock fillets can be oven-baked, poached, grilled or microwaved for ease. Source of protein. Minimum four per pack. Our M&S seafood products have been sourced from fisheries and fish farms in a way that minimises their ethical and environment impact, while guaranteeing you the highest quality, delicious seafood you’d expect from M&S.