I te tau 1971, i te taha matau o te Rōpū Kaimahi, ko Davies tētahi o ngā Mema 69 o te Rōpū Kaimahi i whakahe i te Whip o te Rōpū Kaimahi ki te pōti i te uru atu ki te EEC. I pakanga ia mō te pōti 'Kāore' i te pōti i Wales i te tau 1979
i runga i te hanganga o te Runanga o Wales, me etahi atu mema o te 'Gang of Six', Neil Kinnock, Leo Abse, Donald Anderson, Alfred Evans me Ioan Evans. I te wa katoa o tana mahi hei MP, i tautokohia ia e te uniana whero-kera APEX.