A female, I think. I don't know which species it is.
No interactions present.
Nearest oak is a couple of hundred yards away, but there are other mature trees nearby; beech and walnut, and some pine, as well as elder and hawthorn. I understand they fly quite well, so it could have come from anywhere, pretty well.
Lat/Lng: 51.95765372803, -0.25604825019832
OS grid ref: TL199302