This is already in the forum somewhere, but the mess the search engine is currently in makes it almost impossible to find anything.

The song is one of a set of 3 or 4 songs, the tunes of which are still used for the maypole dance. I was doing it as a child 40 years ago ... and we sang a modified version of the song above. Probably the most famous one in the set is "Now is the Month of Maying",

:-)
Ian