A yellow-orange psyllid, sometimes with paler head, pronotum and genal cones.  The wings are tinted yellow.   The female have very long  terminalia and can be identifed, with care; identification of males requires examination of genitalia

Cacopsylla species.

host/females males

Good quality photographs of females, showing terminalia.  If recording a a male, detailed examination of genitalia is required.  Note host plant.

On birch.

May to August

Common and widespread in Britain. (ref.: British Bugs website; link below)

https://www.britishbugs.org.uk/homoptera/Psylloidea/Psylla_hartigi.html