Here's one for you, Jim.
In the 40s and 50s, even into the 60s a well-loved pub song at the time, if somewhat racist, was 'My Brother Sylvest'. It apparently had many outings during the Sods' Operas of WWII and existed in a variety of versions. Nobody could remember where it came from, how old it was or who wrote it, not that they cared anyway. Could that have been in any way a 'Traditional' or 'folk' song? I don't want to get involved yet again in these pointless arguments but still would be curious to see what you think.