In 1973, Morgan left the British political scene to go and work for the European Commission. Until 1975, he was chief of staff to George Thomson, the European Commissioner for Regional Policy. Morgan later held various EU administrative and diplomatic positions, and helped create the European Development Fund. He was prominent in the "Yes" campaign for the 1975 EEC membership referendum, and was also on the bureau of the Socialist International. In his personal life, Morgan was a director of London Welsh RFC. He was made an Officer of the Order of the British Empire (OBE) in 1999.