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Not seen these before. Not sure if they're in Derbyshire yet. Looks like they have a similar life cycle to A.quercuscalicis, the knopper gall causer, which also needs Turkey Oak for it's springtime galls.
Could you please tag "plant gall" no speech marks I am try to create a project collecting together UK plant gall records
Lat/Lng: 50.9901, -3.23274
OS grid ref: ST135219