Two photos of green leaves with yellowish galls around their edges. Top photo from above, lower photo from below where the galls are more evident.
Maybe this is Plum Leaf #Gall caused by the mite Eriophyes similis on Blackthorn leaves. The bushes had very few sloes.
Beside the Beechy Brook near The Roos farmhouse, south of Saffron Walden. #SaffronWalden #Essex #PlantGall
@galling.bsky.social