Kammala jumla mai zuwa: Ƙaddamar da ƙwarewar Labour na tsarin siyasa na Welsh na musamman an yi jayayya a shekarar 1966 lokacin da shugaban Plaid Cymru Gwynfor Evans ya lashe zaben Carmarthen. Dangane da fitowar Plaid Cymru da Jam'iyyar Scottish National Party (SNP) Gwamnatin Labour ta Harold Wilson ta kafa Hukumar Masarauta kan Kundin Tsarin Mulki (Kwamitin Kilbrandon) don bincika tsarin tsarin mulkin Burtaniya a cikin 1969. Gwamnatin Labour ta 1974-1979 ta ba da shawarar Majalisar Welsh a layi daya da shawarwarinta ga Scotland. Wadannan sun ƙi da masu jefa kuri'a a cikin
1979 kuri'ar raba gardama: kuri'u 956,330 sun yi adawa, 243,048 sun goyi bayan.