I just checked in
Wikipedia my archive of X-files.
H.G. Wells, the author of The Invisible Man novel (and real inventor of the technology) joined efforts with Roy Chadwick in the late 1930s.
B.XX low visibility variant (a.k.a. "Wells Wonder") of Lancaster has been developed by Avro in ultimate secrecy. A limited number were produced and successfully operated as a force of one squadron over the Continent in broad daylight - driving enemy radar operators mad.
Some historians claimed that many nervous breakdowns of Fuhrer in 1945 were caused by a B.XX circling above the Reich Chancellory at a low altitude and playing one particular rude song through the loudspeakers (engine noise was muffled by another secret invention of Mr. Wells).
https://youtu.be/pKp6uD1JAdc?si=8WgjdWkWdrnZBN3fThe files on B.XX were supposed to be opened to the public together with Ultra files in 1974 but descendants of H.G. Wells objected and sued the British Government for (allegedly) not paying royalties.
Fifty years later, the legal battle continued...
When mysterious objects filled the night skies of the U.S.A. before Christmas 2024, some observers claimed to hear the unmistakenly snobbish roar of Merlins. Some said they heard the song but opinions were divided on lyrics content. Was it "Rule, Britannia", "I'm the Walrus" or "Merry Xmas Everybody"(by Slade)? Not the "Y.M.C.A" certainly, so rude.