I'm of these islands & what grabs me with both Steeleye Span & Fairport is the beautiful clarity of the female vocals.
Now this is complicated. These ladies are well spoken, middle class girls. They are singing in a stylised manner, attempting to effect an imaginary rural peasant vocal accent, almost like Thomas Hardy's imagined 'Wessex' of his marvellous output.
But it works. It's never contrived. It doesn't seek sanctuary in any particular Scottish, Irish, Welsh, or indeed re: England, west-country or Lancashire or Yorkshire or Lincolnshire or Geordie or Yorkshire accent... it works.
It just sounds so damned genuine & unpretentious. And its both sensual & sexual.
The vocal art of these ladies, & Richard Thompson's wife Lind, too, just seems like a lost art.
https://www.youtube.com/watch?v=G8avrOiI6F4Thanks man, for bringing me here. English folk always had an unjust inferiority complex where the whole colonial thing made & makes them ashamed for being English, whereas the Scots & Irish could always draw on that 'rebel' thing.
But I take this anyday.