What sort of bug?

Observation - What sort of bug? - UK and Ireland. Description: I don't have a camera to take pictures sorry. I've found an aphid like bug in the hedgerow, it is black, body 5mm long, antennae 2mm long waving around with 3 distinct sections, 6 legs with the top half green, black eyes on side of head, slim oval shaped

I don't have a camera to take pictures sorry. I've found an aphid like bug in the hedgerow, it is black, body 5mm long, antennae 2mm long waving around with 3 distinct sections, 6 legs with the top half green, black eyes on side of head, slim oval shaped black body ending with 2 very small stumps. Any guesses?