Eric it saddens me to learn that English "burrowcrats" are descended from the same government rodents as those of your American cousins. That said Eitek1's offer of an "official" letter, restamping the engine & a copy of our registry should get the ball rolling. If you have Gary Wollard's historical work, that alone verifies the company hasn't existed in decades. Verification of the frame as U.S. Air Force motor pool origin should help. Are there markings on the frame to back this up? If so how long has major U.S. military presence in Great Britain been eliminated or incorporated into that of your own armed services or those of NATO's? I bet it's been a lot longer than ten years, so duties might be eliminated, but for the fact that you're still dealing with the rodent's mentality of disruption of others peace of mind & the need to soil the rules of logic while they determine the outcome of any request & elevate their own estimate of significance. Rick C.