About 1mm, in bark on sycamore trunk.
No identification made yet.
No interactions present.
What an amazingly intricate structure! I think you're probably correct in saying it's constructed by a spider, at least I can't think of another explanation.
Entomologist and biological recorder
Lat/Lng: 53.449978646091, -2.2510047555625
OS grid ref: SJ834948