 Matters considered by the Gen 75 Committee included decisions on what production facilities should be built to produce nuclear weapons, authorising the construction of nuclear reactors to produce plutonium at Windscale, and a gaseous diffusion plant to produce uranium-235 at Capenhurst.It took decisions on the administrative structures that would oversee production, and appointed Marshal of the Royal Air Force Lord Portal, the wartime Chief of the Air Staff, to run the project, which became High Explosive Research.The final decision to proceed with building nuclear weapons, however, was made by another Gen committee, the Gen 163 Committee.