The common opposite work is acid heathland and during a short walk this morning I located this female Keeled Skimmer (Orthetrum coerulescens), another first for me. Note how the wings are held well forward at rest.
Taken with 70-300 lens, f5.6, 1/400. [Click to enlarge]
Try this link for information on British dragonflies: http://www.dragonflysoc.org.uk/species.html