A pale straw-coloured leafhopper, with a pointed vertex and characreristic dark v-shaped markings on the vertex, between the eyes.  There may be a few darker steaks on the forewings. 

vertex markings

Photograph from above and below to show dark marks on vertex; note habitat

grasslands 

Common (ref: UK Auchenorrhyncha checklist 2021, on British Bugs website; the species appears to be spreading northwards)

Rarely recorded

https://www.britishbugs.org.uk/homoptera/Cicadellidae/Rhytistylus_proceps.html