The Foods Standard Agency has said national discount retailer B&M is recalling a shake.
B&M Stores are recalling Biscuit Freak Shake as it contains a milk not mentioned on a label.
The Food Standards Agency alert said: "B&M Stores are recalling Biscuit Freak Shake because it contains a milk protein within the vanilla milkshake powder, which is not mentioned on the label.
"This alert does not affect the Biscoff items contained within the product. This means the product is a possible health risk for anyone with an allergy or intolerance to milk or milk constituents.
"This allergy alert has been updated with the correct name of the product."
It affects all products with the best before date up to and including January 22.
A FSA statement added: "This product contains a milk protein making it a possible health risk for anyone with an allergy or intolerance to milk or milk constituents.
"B&M Stores is recalling the above product from customers and has been advised to contact the relevant allergy support organisations, which will tell their members about the recall.
"The company has also issued a point-of-sale notice to its customers. These notices explain to customers why the product is being recalled and tell them what to do if they have bought the product."
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