DamnYankee
Loyal to the end
Just a few things worth noting. Two of the key personnel on The Manhattan Project namely Sir James Chadwick and Niels Bohr were only there because Britain was not eliminated from the War by the Germans.
James Chadwick who won a Nobel Prize for discovering the neutron was head of the top secret British nuclear directorate codenamed Tube Alloys
A delegation (the Tizard Mission) was sent in September 1940 to North America to exchange technology in all fields, such as radar, jet engines and nuclear research. They also explored the possibility of relocating the British military research facilities in North America, out of reach of the German bombers. One of the key technologies handed over was the gas diffusion process for purifying uranium, using uranium hexaflouride (UF6), into weapons grade U235 without which the Little Boy bomb couid not have been developed. His work on the neutron led directly to the production of the man made elements of which plutonium is the most famous.
Niels Bohr was a brilliant Danish physicist who the British and Americans were terrified would be press ganged by the Germans into working on their nuclear programme alongside Werner Heisenberg. He was smuggled out of Denmark, by way of Sweden, in the bomb bay of a Mosquito fighter by the British and whisked off to Los Alamos post haste in 1943. I am just reading the book American Prometheus about Robert Oppenheimer and the Manhattan project and it tells the story of how it almost ended in tragedy as Bohr did not don his oxygen equipment as instructed, and passed out at high altitude. He would have died had not the pilot, surmising from Bohr's lack of response to intercom communication that he had lost consciousness, descended to a lower altitude for the remainder of the flight. Bohr's comment was that he had slept like a baby for the entire flight.
I contend that the Manhattan Project would have either failed or have been severely set back without the contributions of these two great men. I should also point out that the Germans would have dearly loved to get their hands on the gas diffusion technology.
Interesting history that contributes to my assertion that Britain was more dependent on us than we of them.