Orange Thricops Thricops diaphanus
I suspected this one's ID after running a photo past ObsID and checking Steven Falk's Flickr pages, but I then checked it keyed that way using Mike Hackston's keys.
male Orange Thricops Thricops diaphanus showing side of thorax, squamae, wing, close-up of vein R1, hind tibia and hind coxa, Rush Meadows (Norfolk, UK), 16th June 2025