Read carefully B S I mean BL
No I don't...
https://en.wikipedia.org/wiki/Nuclear_weapons_and_the_United_Kingdom
The project was hidden under the code name
High Explosive Research or
HER and was based initially at the
Ministry of Supply's Armament Research and Development Establishment (ARDE) at
Fort Halstead in Kent,
[44] and also at the
Royal Arsenal, Woolwich. In 1951 it moved to a new site at
AWRE Aldermaston in
Berkshire. The Attlee ministry revealed the existence of a British atomic program in Parliament on 12 May 1948;
[24] the announcement was viewed by Parliament, the press, and the people as uncontroversial.
[40] However, although British scientists knew well the areas of the Manhattan Project in which they had worked they knew little of the other areas. Building a full-scale plant for production of weapons-grade U-235 would be very expensive,
[24] and the McMahon Act prevented American technical aid. The government refused to provide public details on its progress beyond stating that atomic weapons research was of the highest priority, but it was assumed that the project was following the Americans' precedents. While
Leader of the Opposition, Churchill criticised the government in February 1951 for not having completed an atomic weapon.
[40][45]
Note the dates...