I too think this is a great thread. One of the main reasons I follow Audiogon is for artist recommendations and this thread is a corker(English for really really good) I have already ordered some CD, having listened to a number of singers on YouTube.
My own penny, sorry domes worth:
Jonatha Brooke: A great voice and self penned songs.
Judith Owen: A welsh artist, Jazz/SingerSongwriter
Kate Rusby ) Two of the best English folk artists around at the moment
Cara Dillon ) " " "
I hope you enjoy.