Beginning in December 1962, the UK conducted 24 tests at the Nevada Test Site in the United States. The final test was the Julin Bristol shot which took place on 26 November 1991. British nuclear testing was abruptly halted by President George H. W. Bush in October 1992. Because Britain did not test as often as the United States for financial and political reasons, and did not have the Americans' state-of-the-art computer facilities, British weapons design depended more on theoretical understanding, with potential for both greater advances and greater risks between tests.