We take care to cook all of our products separately. Our beef patties are cooked on a griddle, and our Filet-o-Fish, Fish Fingers and Chicken products are cooked in 100% vegetable oil using dedicated cooking vats to separate each product.
However, there is a small chance that the vegetable oil used to cook our fish products can come into contact with the oil used to cook chicken products during the oil filtering process.
Source: McDonalds UK Website
