Yes some nice traditional harmonies certainly Brian and Ruth are the main group (duo) team with added third member(s)

My personal view and I did see them live at least twice and someone has been good enough to let me have a copy of the recordings etc was that they were trying to be TOO GOOD, that is, in my view FOLK needs and expects singers to be real people with faults (o right sorry, yes)

Could find perfection a little irritating, songs are sung differently every time, not totally the same and with harmony this can change sounds a great deal!

nO futher elaboration as you could have a different opinion

Ray