3 to 4 mm.  A very distinctive species associated with Hornbeam.  The ground colour is white or pale yellow.  One form has two dark bands; a second form has a dark grey, dark brown or black area over most of the forewing and pronotum.

Good quality photos required. 

Hornbeam

Summer - Autumn.

Local (ref: UK Auchenorrhyncha checklist 2021)

Uncommon

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