Changes made by 78/638/EEC: Commission Decision of 30 June 1978 authorizing the United Kingdom of Great Britain and Northern Ireland to grant exemptions for national road transport operations from the Community Regulations on social matters relating to road transport (Only the English text is authentic)
EU Decision 1978/638
No changes made by 78/638/EEC: Commission Decision of 30 June 1978 authorizing the United Kingdom of Great Britain and Northern Ireland to grant exemptions for national road transport operations from the Community Regulations on social matters relating to road transport (Only the English text is authentic) are recorded.
From legislation.gov.uk's record of changes, the official one: see it there.