But he could have offered the nameplate to the RAF Museum or the National Railway Museum, instead of flogging it for personal gain….
If he did and they didn’t want it, fair enough. I still have one of the original copies of a historical Spitfire flight, on 16mm film, which I rescued from a rubbish bin over twenty years ago. I offered it to both the RAF Museum and the Imperial War Museum. Neither showed an interest in having it.