Kammala jumla mai zuwa: Fitowar Plaid Cymru (tare da Jam'iyyar Scottish National Party) ya sa gwamnatin Wilson ta kafa Hukumar Kilbrandon kan kundin tsarin mulki. Shawarwarin da suka biyo baya don Majalisar Welsh sun kasance, duk da haka, sun ci nasara sosai a cikin wani
kuri'ar raba gardama a shekarar 1979. Duk da rikice-rikicen Plaid Cymru game da mulkin gida (a maimakon 'yancin kai kai tsaye) sakamakon kuri'ar raba gardama ya sa mutane da yawa a cikin jam'iyyar suka yi tambaya game da shugabancinsa.