the hexagonal shape in theory suggests honey bees anyone have another idea?
No interactions present.
Certainly a social insect, so changed the classification from 'other' to 'invertebrate' for you, so the right people see this.
University of Edinburgh and Biodiversity Observatory (OU)
That is definitely hornet nest material, you can see the layers of wood pulp so not made of wax as a honey bee comb would be.
Lat/Lng: 50.97252, -0.12104
OS grid ref: TQ320209
under a tree in about 50 pieces.