Olibrus liquidus
male Olibrus liquidus showing its aedeagus (side views and 2 flat views showing both parts in focus), North Elmham Cathedral Meadows (Norfolk, UK), 24th August 2020
According to my notes the genitalia were checked on this one too, though I don't have any photos to prove it.
male Olibrus liquidus, North Elmham Cathedral Meadows (Norfolk, UK), 5th September 2020