Quick gather-up...

"I don't think I've got a recording of him doing You Can't Always Get What You Want"

If I'd been cheeky enough to switch on the cassette recorder in our kitchen in the Spring of 91, we'd have had Can't Always Get, Tumbling Dice and Harp Song Of The Dane Women. Chiz...

"Interesting to hear his speaking voice - closer to RP than one might have guessed from the records. The exaggerated regional accent he used when singing was clearly as affected as the bleat"

And your point is...? That traditional songs should be sung utterly without artifice? You can "own" a regional accent without necessarily using it in your everyday speech.

"I believe Kipling was more influenced by music hall songs than folk songs"

Yes, if it's possible to quantify such things. Actually Kipling didn't have much of an ear, by all accounts. He knew his folk song pretty well, but not necessarily through hearing it sung. He'll have known it better on the page, I think.