Streptanus sordidus
This came to light in a small grassy area at the edge of wet woodland. I keyed it using the RES key and checked the genitalia against the diagrams in Biedermann & Niedringhaus.
male Streptanus sordidus showing vertex, frons, forewing, abdomen (dorsal), tip of abdomen (from side, above and below) and aedeagus (in situ, side and flat), Wendling Beck Environment Project (Norfolk, UK), 17th September 2024