The London Naval Conference, 1930.

One in a series of international naval conferences during the inter-war period, including a second in London in 1935, the Washington Naval Conference in 1921-22 and the Geneva Conferences in 1927 and 1932. The great naval powers (Britain, the United States, France, Italy and Japan) renegotiated battleship numbers, agreed on a five-year halt to the major warship-building programme, increased the controls on submarines and continued limits on aircraft carrier construction.

Reference: Hodsoll Papers, HDSL 2/1