Hypera nigrirostris
While I was struggling to eliminate the brown form of this species when I was identifying what I eventually decided was Hypera venusta, I examined quite a few photos of nigrirostris. I was therefore moderately familiar with how the normal green form should look and when I found this beetle in a pitfall trap (in propylene glycol, so no live photos) I had a pretty good idea what it was. But I keyed it out fully, using Duff, to make sure. It's an attractive little thing - I look forward to finding a live example.
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Hypera nigrirostris showing pronotal and elytral scales, Wendling Beck Environment Project (Norfolk, UK), 29th to 31st March 2024