For anyone who doesn't know, this is based on the original song by Victoria Wood, "The Ballad of Barry and Freda," as performed on her show Victoria Wood As Seen on TV
in 1985. As shown by the loving homage, the song is considered one of the seminal works of British comedy.
I can certainly imagine Jonny B as a big Victoria Wood fan. The gays always are. He probably dressed up as Mrs Overall for Halloween one year.