Philotarsus parviceps
Apparently a common species.
This one was beaten from Hawthorn. The wing markings on this species are less distinct than on the similar but scarcer Pilotarsus picicornis. I didn't find it easy to see the abdome pattern which is supposed to differ between the two species. The side lobes of the subgenital plate are apparently narrower than on picicornis.
female Philotarsus parviceps showing forewing and subgenital plate, Wendling Beck Environment Project (Norfolk, UK), 12th September 2024
This was swept from Rhododendron the same day as the one above (at a slightly different location).
female Philotarsus parviceps showing forewing, abdomen and subgenital plate (before and after clearing), Wendling Beck Environment Project (Norfolk, UK), 12th September 2024