Bruce, it is a good enough song to be adopted into folkdom, and the version Cyril sang has slightly different words and half the chorus, so it has been folk-processed.

It's just that we here have a thousand opinions, well aired, about 'What is Folk.' When someone brings IT up, shit and derision immediately descend.

You may still be right, though. Cyril was not a folk bigot.
I think I have that version on a tape somewhere. Maybe I should submit the words for the DT.