The third XP-51F in RAF colours as FR409
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From Joe Baugher
"The third XP-51F was shipped to the United Kingdom on June 20, 1944 after preliminary flight checks. It was painted in RAF camouflage and was named Mustang V. The RAF serial number was FR409. The A&AEE at Boscombe Down found the Mustang V to weigh only 7855 pounds in interceptor trim. They rated it very highly except for a severe lack of directional stability which required frequent heavy application of rudder in certain flight conditions. "
The second XP-51G was shipped to Britain as FR410 in 1945.