Not sure whether these have been confirmed in this area before but this is such a good year for migrant insects there must be more about. At least three were buzzing around Maxey gravel pits today along with a single male Lesser Emperor, another rare migrant.
Pics of both species are on Kevin's blog.
Red-veined Darter Sympetrum fonscolombii
Digiscoped with Nikon Coolpix P4 and Leica APO77 20x