In spite of the fact I defined the challenge, this is not to be taken as the 'official' take on the song.
In fact, what happened is this:
I wrote the lyrics, played some chords and sang a provisional tune, making sure it made harmonic and melodic sense to me, then DIDN'T record it, but posted the words/chords to FAWM.
I came back to it the next day and recorded a quick one-take to make sure I had SOMETHING down for my own submission but I'm 95% sure I'd changed it a little by the time I came back to it.
Then I sat on the recording