Maybe Terry "Cruncher" O'Neill should be giving credit and calling the song 'Mandela' as it's writer, Dan Hannon, intended. This would help educate people and stop spreading misinformation. If he (O'Neill) feels that he can sing and record a song, then it is his obligation to be truthful about it's origins, including both that it was written by Dan Hannon, and that it was first sung by Mary Courtney.
Sin-é.