The Norfolk Hawkers (a.k.a. Green-eyed Hawkers) were previously rare and seen only in Norfolk in the UK, and considered endangered. I have posted some shots of ones I saw in Suffolk. But, this morning I saw the first one locally in Cambridgeshire. The second shot is amusing, it kept its head perfectly horizontal and swivelled its body through 90 degrees to bank before rotating its head.
The first two should be seen as a pair, showing the acrobatic ability of the dragonfly. Here they are as an animated gif (it took me ages to align the heads!)