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.
From September to November 1931, Hennessy held a position within the National Government under Ramsay MacDonald's leadership. He later became Vice-Chairman of the Conservative and Unionist Party from 1931 to 1941.