Just received a note from Ian Gray [with supporting photo - not digital] that he found a small colony of Beautiful Demoiselles at another new location on 1st June. It is a small fast flowing stream which eventually runs into the Salisbury Avon. The spot is about halfway between Patney and Etchilhampton - east of Devizes - called Hail Bridge.
It just goes to show if you risk a speculative visit to a new location you never know what you might unearth. It's beginning to look as if this species is far more widespread in Wiltshire than previously thought. Some of it may be due to genuine recent expansion but some is probably due to increasing observer coverage. This wet weather will obviously quieten things down for a while but hopefully for not too long.