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(www.japantimes.co.jp, Aug 4, 2013)
Britain backed use of A-bomb against Japan: U.S. documents
ttps://www.japantimes.co.jp/news/2013/08/04/national/history/britain-backed-use-of-a-bomb-against-japan-u-s-documents/

Britain supported the use of atomic bombs by the United States against Japan in World War II about a month before the first one was dropped on Hiroshima,
documents recently declassified by the U.S. National Archives and Records Administration showed.

The documents illustrate Britain’s involvement in the United States’ decision to carry out the A-bombings of Hiroshima and Nagasaki in August 1945,
something not widely known in Japan.