The Gold Spotted Sylph is a very small butterfly, compare it with the leaves they have settles on. It was quite common in our garden (where all the above were taken), perhaps attracted by our stream. The bright gold and dark brown are unmistakable. The male (top) has a dark brown hind wing underside. The bottom two are of the same individual, I think a female. She has with a lighter brown hind wing underside with gold patches.
The only other place I found it (a single record) was at Ferncliffe.