Aphids can rarely be described as handsome creatures, but Megoura viciae is perhaps as close as it gets! A large shiny green globular bodied aphid with black head, legs and antennae.  It also has startling red eyes.

The leaves at the tip of the shoot become crumpled and may be true galls.

two other aphids cause similar shoot damage - Aphis craccae and Aphis fabae. The aphids are not similar, however. 

Where vetches or pea plants are present.

Most often noticed in summer clustering on the stems of the host plants.

The vetch aphid does not host alternate, but spends it entire life cycle on leguminous plants, especially vetch, peas and broad beans. Eggs are laid at the base of vetch or pea plants and hatch in spring. Populations build up and after three generations winged forms are produced which disperse to other plants. Megoura viciae generally move to the seed pods in autumn.

Poorly recorded in Britain but probably fairly frequent and widespread.

Status in Leicestershire and Rutland not known.

https://influentialpoints.com/Gallery/Megoura_viciae_Vetch_aphid.htm