You beat me to it Trevor, so I didn't have to type it up! It was written by Dave Turner, a native of Nottingham I believe. I saw him once in 1976 and he was very funny - although what the Irish call "a bit scruffy". He did long monologues accompanied by his guitar - a little bit in the style of the talking blues/rag of Woody or Arlo Guthrie. I wonder what happened to him.