Did you know that there are legal restrictions on what you can feed pigs, including pet pigs?
"You can’t feed pigs catering waste from any domestic or commercial kitchen, including kitchens that only cater for vegetarians. Catering waste includes used cooking oil."
You can find the information on the govt.uk website at https://www.gov.uk/guidance/keeping-a-pet-pig-or-micropig or contact the Animal and Plants Health Authority. Like the Movement regulations, those on feeding are designed to prevent the transmission of disease.