This is a very old-fashioned book, I can't imagine it being published today or being successful. It's an odd addition to the Persephone stable and I felt a bit cheated because I would have expected something better from this publisher.
Apparently this book was a great favourite of the Queen Mother, which doesn't surprise me. This is a novel that would appeal to a specific social class during a specific time period.
It's a thin story without much in the way of plot or character development. If you're curious about it, borrow it from the library or try to find a very cheap second hand edition. It's certainly not worth £12.