The Animal By-products Regulations establish requirements for the handling and storage of raw hides and skins, for the approval of premises and for the disposal of unprocessed waste.
A general guide to the Regulations can be found via the following link:
http://www.defra.gov.uk/animalh/by-prods/default.htm
Under these regulations, premises tanning raw hides and skins are classed as "technical plants" and a brief guide to conditions applying to these plants can be found via the following link. This guidance also explicitly excludes material that has been limed, pickled and or tanned from the scope of the regulations.
http://www.defra.gov.uk/animalh/by-prods/pdf/technicalprods.pdf
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