From the BPA guide for new pig keepers.
It is permissible to source certain types of former foodstuffs (see above), as well as fruit and vegetables, from non-catering premises for feeding to pigs, but this must only be done from those premises that either do not handle materials banned from being fed to pigs, or that have (HACCP) procedures in place to ensure complete separation from prohibited materials, and these procedures have been agreed with the local authority.