Stuck to some polystyrene insulation under the floorboards was this beautiful (and apparently unoccupied) nest - most likely the work of a queen wasp. It is the size of a ping pong ball, weighs 0.4 grams and there are a dozen or so hexagonal cells inside. There is a gap of nearly a foot between the underside of the flooring/insulation and the cement and damp-proof course - she will have presumably come in through the vents in the brickwork to make a home in this space.
I'm just struck by how beautifully crafted it is!
|Side view of nest|
|A look inside - showing some of the cells|