I discovered this blooming right up through the creeping phlox and English Ivy in one of the small sunken gardens today. It looks like a bluebell, but I have no idea what it really is. Don't remember ever planting anything like it in this spot, and how it managed to push its way up through the ivy is a mystery. By the time I discovered it today, the blooms have become a faded blue. Just a solitary stalk.
Sorry, not a very good photo.