Gall-like growth on branches of Oak tree.
No interactions present.
You are right in that the gall causer is an insect. I use the term 'oak pest' in the context of the tree's health. Kind regards
Lat/Lng: 53.4191, -2.6949
OS grid ref: SJ539915
Growing in one of several woods around the fringes of the country park. Reclaimed colliery and agricultural land restored to meadows for recreation.