Confidence: I'm as sure as I can be.
Notes: I'll have a bit of a go. The large second antennal segments and the spurs at the end of the hind tibia (fuzzy, but definitely there) indicate that this belongs to Fulguromorpha, and the general form means that it belongs to Delphacidae because (at least in U.K.) the other Fulguromorpha look totally different. After that I'd be wise not to speculate - but I will anyway. Using British and German literature the only genus with the very bold vertical stripes on the frons is Ribautodelphax, of which German has 6 species and U.K. has 4, all on grasses in open habitats. The ice is thin!