No interactions present.
Such swellings are more likely to be burrs rather than the product of Crown Gall. Such features could be a response to damage or infection, but the latter does not necessarily have to be Agrobacterium tumefaciens.
It does look like little twigs are growing out of it. I have also seen this on Birch. Both Oak and Birch do get Crown Galls on them. Certainly an infection.
Lat/Lng: 51.6128, -3.9816
OS grid ref: SS628923