Aphids (Aphididae)
Lots more to be added when I go through these systematically...
Ragwort Aphid Aphis jacobaeae
Bird Cherry-Oat Aphid Rhopalosiphum padi
Ivy-leaved Toadflax Aphid Dysaphis gallica
Mugwort Aphid Macrosiphoniella artemisiae
Pink Tansy Aphid Metopeurum fuscoviride
Black Willow Bark Aphid Pterocomma salicis
Common Dogwood-grass Aphid Anoecia corni
Corsican Pine Aphid Cinara acutirostris
Green-striped Spruce Aphid Cinara piceicola
Spotted Green Pine Needle Aphid Eulachnus agilis
Giant Willow Aphid Tuberolachnus salignus