The country of origin of a food product is deemed under World Trade Organisation (WTO) rules to be the place of last substantial change. Therefore, bacon cured in Britain with imported pork can legally be labelled as British. Nevertheless, the Food Standards Agency considers that, in some cases, such labelling may not be helpful for consumers. It, therefore, produced voluntary guidance in 2002, recently revised, to help industry comply with the law and adopt best practice. This recommends, for example, that bacon produced in Britain with imported pork should say so on the labelling.