Aphthona nonstriata
I'm not quite sure if the leaf I found this on (in the photo below) was Yellow Iris (which it's typically found on) or Common Reed, but both were in the immediate vicinty.
, Dillington Carr, 26-May-23 (A) (1).jpg)
, Dillington Carr, 26-May-23 (A) (5).jpg)
, Dillington Carr, 26-May-23 (A) (2).jpg)
, Dillington Carr, 26-May-23 (A) (3).jpg)
, Dillington Carr, 26-May-23 (A) (4).jpg)
, Dillington Carr, 26-May-23 (A) (6).jpg)
, Dillington Carr, 26-May-23 (A) (8).jpg)
female Aphthona nonstriata showing pronotum and spermatheca, Wendling Beck Environment Project (Norfolk, UK), 26th May 2023