'Striped' Aphids on Common Walnut
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Prenolepis imparis appears to be an ant
Yes you're right! The website I looked at seemed quite good discussing the differences between the 2 common species of walnut aphid, but the image for the Dusky-veined aphid was wrongly labelled with the ant species name for some inexplicable reason! They also give the name as Callaphis juglandis but elsewhere (and on NBN) it is given as Panaphis juglandis.
Yes, Panaphis looks a better bet. Chromaphis is a pale yellowish aphid, but some images that appear for it in Google show Panaphis instead.
Yes I found that too - just goes to show you can't always trust the internet!
Lat/Lng: 51.584043325681, -1.5537728834153
OS grid ref: SU310873
Common Walnut leaf on large tree near campsite