Meant to say, I have heard Sheila Stewart sing it on a number of occasions: she had a great way of putting a song across, using her story-teller's gift of drawing in her audience. I say "had" as she retired from public performing at a sellout concert at Auchtermuchty Festival 2 years ago, and was adamant that there would be no temporary lay-off followed by a series of come-backs!
Interestingly, she also used to say that she could not sing her mother's songs until after she was given permission in Belle's old age, or some of them had to wait until Belle was gone.