Size about 1.5cm long.
Pond is still water, well isolated from other ponds and has no inflow only rain.
No interactions present.
Are you able to add what size it was please and where you found it, i.e. still or running water ?
Chris Brooks - www.dragonfly-images.co.uk
My Flickr site - www.flickr.com/photos/ceb1298
Lat/Lng: 53.783648, -3.057247
OS grid ref: SD304324
Solaris Centre New South Promenade, not North Prom as stated in location title