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Also, but can't see in photographs, there should be a small convex part of the gall visible on top of the leaves.
Currant galls can also appear on the male catkins.
Same gall wasp produces common spangle galls on the underside of the leaves in late summer.
There was a convex part of the gall visible on top of the leaves.
Lat/Lng: 53.7118, -1.9366
OS grid ref: SE042239