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This is the spring (sexual) generation gall of Neuroterus quercusbaccarum, the alternate generation (agamic) of which causes spangle galls later in the year. This gall also occurs on catkins when it really does look like a currant.
HI Peter I agree with you it is N. qb, but you appear to have clicked on the agree button for C. qf
Lat/Lng: 52.589493434703, -1.9371418873091
OS grid ref: SP043990