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Would have agreed earlier, but only just become aware of this gall wasp species. It seems to have a similar life cycle to A.quercuscalicis, the knopper gall causer.
Not sure if it has reached this part of Derbyshire yet.
I had to look carefully. Used the excellent book "Britain's Plant Gall" by Michaal Chinery. As the gall had not affected the whole of teh acorn but only partially I thought this the most likely. Not really looked that closely at galls before is year, so already learning a lot. This was found down in Sussex, not look nearer home yet here in South Wales, but will do so hopefully before the acorns drop.
Could you please tag "plant gall" no speech marks I am try to create a project collecting together UK plant gall records
Lat/Lng: 52.6642, -0.6175
OS grid ref: SK935082