Galls

Caused by Gall Wasps on Quercus robur, the old brown ones by Knopper Gall Wasp Andricus quercuscalicis but I'm not sure about the fresh green one and think that could be Andricus grossulariae as there were some clear specimens of that on the same tree (there is one in the background to the top right) and all the other Knopper Galls I saw were brown.

Done