Changes made by 78/251/EEC: Commission Decision of 21 December 1977 relating to a proceeding under Article 85 of the EEC Treaty (IV/29.236 - Sopelem/Vickers) (Only the French and English texts are authentic)
EU Decision 1978/251
No changes made by 78/251/EEC: Commission Decision of 21 December 1977 relating to a proceeding under Article 85 of the EEC Treaty (IV/29.236 - Sopelem/Vickers) (Only the French and English texts are authentic) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.