Changes made by 77/283/EEC: Commission Decision of 30 March 1977 authorizing the United Kingdom to restrict the marketing of seed of certain varieties of agricultural plant species (Only the English text is authentic)
EU Decision 1977/283
No changes made by 77/283/EEC: Commission Decision of 30 March 1977 authorizing the United Kingdom to restrict the marketing of seed of certain varieties of agricultural plant species (Only the English text is authentic) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.