 He was the youngest member of the House of Commons to take his seat, though Joseph Sweeney, an abstentionist Sinn Féin member, was younger.He soon distinguished himself as an orator and political player, one marked by extreme self-confidence, and he made a point of speaking in the House of Commons without notes.Mosley was at this time falling out with the Conservatives over Irish policy, and he condemned the operations of the Black and Tans in Ireland against civilians.