Kammala jumla mai zuwa: Saboda dangin mahaifin Mitchell wanda aka haifa a Merseyside sun kasance daga Scotland kuma mahaifiyarsa Welsh ce, Mitchell ya ɗauki kansa ɗan Burtaniya ne maimakon Ingilishi. Ya bincika asalinsa a cikin wani shirin talabijin na "Wanene kuke tsammani ku ne?", Gano alaƙar sa da masanan Gaelic John Forbes da Alexander Robert Forbes. A ranar 7 ga watan Agustan 2014, Mitchell na daya daga cikin mutane 200 da suka sanya hannu a wata wasika zuwa ga "The Guardian" suna nuna fatan su cewa Scotland za ta zabi zama wani ɓangare na Ƙasar Ingila a watan Satumba.
kuri'ar raba gardama a kan wannan batu. Kasancewar Mitchell a cikin wasikar bude ta biyo bayan wata shafi na "The Observer" na watan Mayu na 2011, wanda ya kammala da cewa "Idan Scotland ta tafi ita kadai... 'yan Burtaniya za su rasa ƙasarsu".