Three species have spread rapidly across parts of Britain recently.  Norfolk Hawker (Aeshna isoceles) has been present in small parts of eastern England for many years and has expanded its range only recently, though is yet to be recorded in the New Forest.  With sightings either side of us in Titchfield Haven and Radipole, it shouldn't be long before it turns up except that someone (?) once suggested to me that they might not like acidic water.  Willow Emerald Damselfly (Chalcolestes viridis) is a recent arrival in Britain and has spread dramatically since. A very few have been seen in the Forest since 2022, though I know there have been more sightings than records that have reached the NBN Atlas.  ​Small Red-eyed Damselfly (Erythromma viridulum) is another newcomer to Britain and has been seen increasingly often within the Forest since 2007; it is now not too hard to find.

​By the way, Aeshna isoceles is the correct spelling; someone in taxonomic history wasn't using a spell checker.  The first part (the genus) has been subject to discussion in recent years but I think it is settled on the version given here; it's what the BDS use anyway, so that's fine by me.