Timeline of strategic nuclear weapon systems of the United Kingdom

[7] Fearing the loss of Britain's great power status, the UK resumed its own project,[8] now codenamed High Explosive Research.

[11] The British hydrogen bomb programme demonstrated Britain's ability to produce thermonuclear weapons in the Operation Grapple nuclear tests in the Pacific,[12] and led to the amendment of the McMahon Act.

The nuclear Special Relationship between the two countries has involved the exchange of classified scientific data and fissile materials such as uranium-235 and plutonium.

[17][18] The US also supplied the Royal Air Force and British Army of the Rhine with nuclear weapons under Project E in the form of aerial bombs, missiles, depth charges and artillery shells until 1992.

[23] Since 1998, when the UK decommissioned its tactical WE.177 bombs, the Trident has been the only operational nuclear weapons system in British service.