Changes made by 94/274/EC: Commission Decision of 18 April 1994 laying down the system of identification for dogs and cats that are placed on the market in the United Kingdom and Ireland and not originating in those countries
EU Decision 1994/274
No changes made by 94/274/EC: Commission Decision of 18 April 1994 laying down the system of identification for dogs and cats that are placed on the market in the United Kingdom and Ireland and not originating in those countries are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.