eggs of the common green beetles you see on docks, foolishly I did not photograph the adults as well so might not be able to get a good ID
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As it happens, I did see some eggs of Gastrophysa viridula yesterday (with mating pairs of beetles on the same leaves), and they looked not unlike this, but I'd hesitate to identify it from the eggs alone!
Entomologist and biological recorder
Lat/Lng: 51.96204, -0.663513
OS grid ref: SP919301