One of Bush's first actions as the chairman of the NDRC was to arrange a clandestine meeting with Air Commodore George Pirie, the British air attaché in Washington, and Brigadier Charles Lindemann, the British Army attaché (and Frederick Lindemann's brother), to discuss a British offer of a full exchange of technical information. Bush was strongly in favour of this proposal, and at their meeting on 8 July 1940, he offered advice on how it should be presented. It was endorsed at a Cabinet meeting on 11 July, and an official acceptance was conveyed to Lord Lothian, the British Ambassador to the United States, on 29 July.