A small planthopper - 2 - 2.5mm.  Males have a dark abdomen with a pale mid-line, and pale brown head, pronotum and forewings.

There are several similar species, and care is needed with ID

Close-up photographs of male. Dissection of male genitalia will confirm ID

Dry grasslands

Local (ref.: UK Auchenorrhyncha checklist 2021)

Few records, possibly under-recorded in suitable habitat

https://www.britishbugs.org.uk/homoptera/Delphacidae/Kosswigianella_exigua.html