Larva hanging by a thread from an Oak tree. The photo is a combination of two shots and shows the topside and underside.
No interactions present.
Not very familiar with the larva of this species but in my experience they look a lot greener than this.
See http://www.ispot.org.uk/node/138539 for an example.
Lat/Lng: 51.3697, 0.015
OS grid ref: TQ403653