 He campaigned for a 'No' vote in the 1979 referendum in Wales on the establishment of a Welsh Assembly, along with other members of the 'Gang of Six', Neil Kinnock, Leo Abse, Donald Anderson, Alfred Evans and Ioan Evans.Throughout his tenure as MP, he was sponsored by the white-collar trade union APEX.Davies was Secretary of Tabernacle Chapel, Gowerton, continuing in that role while a Member of Parliament.