http://www.legislation.gov.uk/uksi/1981/7/madeThe Diseases of Animals (Approved Disinfectants) (Amendment) Order 1981enKing's Printer of Acts of Parliament1981-01-15 The Diseases of Animals (Approved Disinfectants) (Amendment) Order 1981InstrumentThe Diseases of Animals (Approved Disinfectants) (Amendment) (No. 2) Order 1983