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You need to comply with UK legislation https://www.food.gov.uk/business-guidance/pet-food
You should also check the local legislation in the counties you will be selling your products in to ensure that you are in compliance with such legislation as well, if there is any.
You may wish to become a member of PFMA if you are not already as they may be able to provide you with assistance and guidance: https://www.pfma.org.uk/legislation
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