It all depends on which singer or record you learnt a song from - in the 60s we were all singing American songs with a hint of Paxton or Baez or any of the Seegers. Then when we discovered the Watersons or the McPeake's we tended to copy them. It's very hard to sing some of the songs from Northumberland without a Geordie accent and Jimmy Miller himself tended to sing some of his songs with a broad Scots accent, although he came from Salford.
If I sing British songs with my usual Kiwi accent it sounds horrible - well maybe it does anyway, but songs like Coulter's candy need a slight lilt.
Robyn