Thanks Maeve.

The tune is very simple and the harmonic progression is, at heart, pretty basic - but the sheet music is very densely packed with chords which include a fair few passing notes, and it all looks and sounds more complex than it has to be.

In passing, I note it's the reverse of the English coin minted by Vesta Victoria...

"I used to think that he was my young man.
He used to call me his little Mary Ann.
But mother caught his eye and they got married on the sly -
Now I have to call him Father!"