Hennessy held the latter position also from September to November 1931 in the National Government of Ramsay MacDonald. From 1931 to 1941 he was Vice-Chairman of the Conservative and Unionist Party.
Hennessy served as a member of the National Government during Ramsay MacDonald's tenure, holding a position from September to November 1931. He later became Vice-Chairman of the Conservative and Unionist Party between 1931 and 1941.