I too am skeptical of the attribution to Blockley.

For one thing, Blockley seems to be known as a composer, not a lyricist.

WorldCat.org lists at least 50 pieces composed by him; nearly all of them identify a different person as lyricist. Of the few remaining, I haven't been able to verify that any have lyrics at all--they seem to be instrumental pieces.

So if Blockley had anything to do with this song, it seems most likely he composed music to go with someone else's lyrics--or maybe somebody made up words to go with one of his tunes.