for
Vanity Fair, 1906 Lowther represented Great Britain at the International Conference at Venice in 1892, and at the International Conference on Emigration at Rome in 1924. He was Chairman of the Speakers' Electoral Reform Conference in 1916–1917, of the Buckingham Palace Conference (on the partition of Ulster) in 1914, of the Boundary Commissions (Great Britain and Ireland) in 1917, of the
Royal Commission on Proportional Representation in 1918, Devolution Conference in 1919, of the Royal Commission on London Government, 1921–1922; of Review Committee Political Honours, 1923–1924, and Statutory Commission on Cambridge University, 1923; of the
Agricultural Wages Board from 1930 to 1940; of the Lords and Commons Committee on Electoral Reform, 1929–1930; and of
BBC Enquiry Committee, 1935. He was a Trustee of the
British Museum from 1922 to 1931 and a Trustee of the
National Portrait Gallery from 1925. In 1907 his portrait was painted by
Philip de László. ==Honours==