The White Admiral - a lovely species that frequents sunlit glades in woodland at this time.
A graceful flyer occasionally gliding, but usually quite fast and difficult to keep up with. It spends a lot of time flying around the same area landing mostly on the leaves of lower branches and occasionally on bramble flowers.
Once you know for a territory, its best to visit the same area each year as you are most likely to find it again. Only flying from late June to the end of August you have to be specific with that period to find it. Also it will soon deteriorate in appearance, looking quite drab with damaged wings.