As far as I recollect, the Brits were obliged to give information to the Americans as part of repayment due to the Americans for all their input into the war effort here. Having got the flying tail info, I understand that we were then frozen out by the brothers and Miles were obliged to scrap their aircraft.
I further understand that there was a certain amount of "getting one´s own back" when a request for information on the computer controlled variable intake doors of Concorde was made to Bristol. Allegedly, the debt was already paid by then and Bristol, quite rightly, required squillions for the info. The Americans declined to pay which is why our supersonic airliner flew for years whilst the (B1?) was never a supersonic success.
If true - great!