Not Lincolnshire
Something reminded me of the old 'Lincolnshire Poacher' clandestine broadcast. I don't think it's ever been properly explained.
Here's a nice rendition of the entire Grainger 'Lincolnshire Posy' suite by a young Japanese band. This version has plenty of the
'articulation' that is too often missing from modern Western performances of classical-type stuff.
Turns out the tune I always heard on shortwave was NOT the Lincolnshire tune. No connection at all. It's not anywhere in the suite!
Here is my MIDI transcription of the basic tune that I heard in the early '60s. It changed subtly all the time.
Audio steganography based on the deltas in notes and timing?
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Sidenote on Grainger: As I was listening to various versions on Youtube, I noticed a strong and consistent theme among the comments. Everyone who had ever played the suite in school band praised Grainger's 'gift' to their particular instrument. I doubt that any other composer spread so much joy among the performers AND the audience!