asked the Secretary of State for Foreign Affairs how many nuclear bomb tests have been detected in the last year; which powers made the tests; and what progress he has made in Her Majesty's Government's policy of seeking to negotiate a comprehensive test ban treaty.

China has conducted one atmospheric test during the last year. The United States have announced that they have conducted thirty-seven tests underground and, as hon. Members know, there has been one British test. We are uncertain about other countries. None has been announced by the Soviet Union, but at least six have been reported; none has been announced by France. We hope that the Eighteen Nation Disarmament Committee, which resumes tomorrow, will give serious attention to the negotiations for a comprehensive test ban.