Pollock was an Ulster delegate to the 1917-18 Irish Convention, taking part in the Grand Committee whose aims were to help resolve the important political decision of the "Irish Question" and other constitutional problems relating to an early enactment of self-government for Ireland, to debate its wider future, discuss and come to an understanding on recommendations as to the best manner and means this goal could be achieved. It was a response to the dramatically altered Irish political climate after the 1916 rebellion and proposed by David Lloyd George, Prime Minister of the United Kingdom of Great Britain and Ireland, in May 1917 to John Redmond, leader of the Irish Parliamentary Party, announcing that 'Ireland should try her hand at hammering out an instrument of government for her own people'.