Third out of fifth nuclear-weapon states that are under the NPT, the treaty of the Non-Proliferation of Nuclear Weapons. The first successful test in the nuclear history of Great Britain occurred in October 1952, three years after Russia’s first successful attempt. “Hurricane”, which was the codename for the test assumed the use of 3 megaton bomb, which was dropped in Australia. The UK itself did not have many tests after that. Comparing to a thousand and hundreds of tests by Americans and Russians, the Brits made only 45 tests of nuclear arsenal.
We should remember about the fact that United Kingdom was in a strict cooperation with United States at the very beginning. It means that we cannot forget about the tremendous help the Americans received from the British government and men of science while developing their first nuclear bomb. Unfortunately, all the data that USA could not be sent back to the UK, since the cooperation has ended prematurely. This was one of the reasons why UK developed their first nuclear weapon so late. At this moment, they possess 215 warheads in total, out of which 120 is deployed and completely operational.