Carlo (1969)

 https://www.bing.com/videos/search?q=carlo+windsor+polo+song&docid=607991211509351471&mid=F7A1FE1A763101CD9D1CF7A1FE1A763101CD9D1C&view=detail&FORM=VIRE

https://quod.lib.umich.edu/m/mp/9460447.0007.203/--songs-of-malice-and-spite-wales-prince-charles-and-an-anti?rgn=main;view=fulltext