It is like a fairy glade isn't it Fog. The bottom is a bit of a mess though. We have two apple trees and a pear tree but the willow has been blocking out so much sunlight that nothing was really getting a fair crack.
We want to put a summer house where the shed is. I love the idea of lights.
Well as I said, no children, so it'll be a grown up sitting about in garden. It's too dark to grow any vegetables really. There is also a patio at the top by the house. The funny thing about it is that we can't get to it directly from our house, we have to go out our back door, down a shared set of steps and through a gate.
I very much like the way you've created a circular area towards the front by just hinting at the circle rather than filling in the whole thing - it looks terrific. In fact, it's SO nice that I'd be tempted to do it again further up but on the opposite side: so you have a circular area to the left at the bottom, and a circular area to the right in the middle third of the garden, with a narrow, very curvy path inbetween. It would involve shifting the second third of the path quite a bit more to the left, so it follows the line of that existing circular mini-hedge you've so cleverly planted. You'd then use the same kind of circular movement with another row of shrubs to the right.
This would give you a real sense of drama: you see the first circle, you walk through a narrow area where the path is framed quite closely on both sides by circles and then a second part of the garden unfolds on the other side, and then you have the lovely, shady end of your garden as a third area.