art 28 Markets
(1) A market operator must ensure that all animals are divided into lots of one or more animals immediately upon their arrival at the market and that a lot number is allocated to each lot. (2) No person may buy an animal at a market unless he or she buys all the other animals in the lot to which that animal belongs and moves the entire lot from the market to the same holding. (3) No person may sell an animal at a market unless he or she also sells all the other animals in the lot to the same buyer. (4) A market operator may not receive an animal onto a market unless — (a) it is identified in accordance with Part 2; and (b) it is accompanied by a movement document which is completed in accordance with Part 6.