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The RAF had 'Stangs, of course it was a British design, and a British engine....

Kevin its in the US, Oshkosh, Wisconsin to be exact

North American Aviation was under contract to produce training aircraft for the British. Then Kindelberger somehow, with no real evidence that it could be done, convinced the British that North American Aviation could design and build a new fighter that was better than the P-40. The new fighter would fly faster, higher, farther, be more maneuverable and pack more firepower. The British took NAA at their word because they had performed well with British orders for the NAA Harvard trainer. British approval by letter of intent was given on 10th April 1940. Shortly after, 23 May, a contract order was placed by the British for the first 320 aircraft designated NA-73.

NAA vice-president Lee Atwood was sent to Curtiss Aircraft to pick up the wind tunnel data of the Curtiss XP-46 that NAA purchased for $56,000 at British request. Kindelberger put Edgar Schmued in charge of the new design. Others who worked with Schmued included Ed Horkey, Raymond Rice , Larry Waite and Art Chester. After 78,000 man hours and 102 days later, the prototype, NA-73X, rolled out of the hangar - without an engine. 18 days later, the Allison V-1710-39 was ready and on 26 October 1940, NX19998 took to the skies for its maiden flight with test pilot Vance Breese at the controls. On 9 December 1940 the British Purchasing Comission sent a letter to North American Aviation stating that the NA-73 airplanes have been given the official designation of "Mustang".