I learnt it from my Grandad who had learnt it from his father who had been a music hall performer (and sung it in the music halls), silent movie pianist and ended his performing days in Will Catlin's Peirots on the beach in Scarborough. It all comes out when I have a few too many but I am blowed if i can remember it sober, well, other than the line " the little pigs sit with arses bare ...." and he used to sing funicle man