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Thanks David. I wasn't sure of this as I've never knowingly seen a young Knopper Gall. The Oak had Knopper Galls on it and even adjacent to the ones you've suggested.
I could see it was different but thought that it was just young. How interesting, thank you!
Certificate in Contemporary Science (Open)
Lat/Lng: 51.528, -0.161153
OS grid ref: TQ276826