Supermarket chain Morrison's has recalled a batch of its chicken and mushroom pie ready meals - because they were found to contain fish pie.
The retailer issued a consumer notice, while the Food Standards Agency also sent out a warning to customers.
The Food Standards Agency said: "Morrisons is recalling Traditional Chicken & Mushroom Pie because a small number of packs have been identified to contain Fish Pies. The Fish Pie contains fish and mustard which are not mentioned on the label and therefore are a possible health risk for anyone with an allergy to mustard and/or fish."
A statement from Morrisons said: "Morrisons is recalling the above product because it may contain mustard and fish that are not declared on the label. This means the product could pose a possible health risk to anyone with an allergy or intolerance to these allergens. We are asking all customers with a mustard or fish allergy or intolerance not to consume this product and return it to their nearest store for a full refund."
No other Morrisons products are known to be affected.