Well, from what I can quickly tell (and hey, I'm supposed to be at work auditing work orders in this verdamnt new computer system we bought. . . a pig in a poke if you ask me!) you sir are correct! My bad memory at work. . . Here's one blurb I found:
In 1958, Ellington took his orchestra to an arts festival in Leeds. There, he was introduced to Queen Elizabeth at a reception, and each party appeared to be charmed by the other. Upon his return to New York, Ellington decided to express his admiration in his own regal way---he recorded The Queen's Suite at his own expense and had a single pressing made and delivered to Buckingham Palace. He never sanctioned the recording's release during his lifetime.