Whakakiia te rerenga e whai ake nei: I tu ia mo te Rōpū Mahi i te nohoanga haumaru o te Conservative o East Fife i te pooti whānui o te tau 1970, ka ngaro ki te MP o Sir John Gilmour. I riro ia hei Mema o te Paremata mo Stirling me Falkirk i te pooti-a-rangi i te Mahuru 1971, whai muri i te matenga o Malcolm MacPherson. I whakaingoatia tana nohoanga ki a Stirling, Falkirk me Grangemouth mo te pooti nui i te Hui-tanguru 1974; ahakoa nga huringa ki nga Scottish Nationalists, i mau tonu ia i te nohoanga i te Hui-tanguru me te Oketopa 1974, engari he nui te nuinga. I tohua ia e Harold Wilson hei Hekeretari o te Kawanatanga mo Scotland me te kawenga mo te whakakorenga me nga mahi o roto, me te pupuri i taua tuunga i raro i a Jim Callaghan i te wa i akiakihia e te kawanatanga mahi ki te tono mo te whakakorenga o Scotland.
Ko te pōti whakamutunga i te Poutu-te-rangi 1979 kāore i whakaaetia e te nuinga nui. I hinga te kawanatanga mahi i te pooti nui i muri mai i te tau 1979, ahakoa i mau tonu a Ewing i tana nohoanga me te nuinga nui ake. I noho ia hei kaikorero mo te umanga o Scotland i te tau 1981. Ko ia te tuatoru i te pooti mo te tumuaki o te Paremata Mahi Paremata i te marama o Noema 1981. I whakahoutia ano tana nohoanga i te pooti nui o te tau 1983, a ka hoki mai ia mo te nohoanga o Falkirk East, a ka noho ia hei kaikorero mo nga take tauhokohoko me te ahumahi i raro i a Neil Kinnock. I whiriwhiria ano ia i te tau 1987, a ka tu atu ia i tana tūranga o mua. Ko ia te tumuaki tahi me David Steel o te Scottish Constitutional Convention i hangaia i te 1989 hei whakamahere mo te whakakorenga o Scotland i whakamaherehia mena ka wikitoria a Labour i nga pooti nui o te tau 1992. I hinga te pōtitanga i a Labour, ā, i whakatūria ngā mahere. I reti a Ewing mai i te Whare o te Whare i nga pooti nui o te tau 1992.