Arachnophile

Not the crispest picture, even allowing it is my phone, but this is something of a paparazzi shot - bending over, through a slit behind a door, zoomed in, and it's only 10mm long - so I'm quite pleased to have something good enough to identify it. All the web sites I have looked at describe it as not often seen because it is "elusive" and "secretive", so maybe I should see what the tabloids will offer me 

This is one of those species (Auplopus carbonarius, probably) about which the nicest thing you can say is that it loves its children. She loves them so much that she feeds them dead spiders. It is a solitary wasp that lays a cluster of eggs in a pre-existing cavity of some kind. She constructs a dozen or so mud-walled cells and then goes on a spider hunt. When she finds one, she stings it to paralyse it, nips off the legs (it looks as if she left one or both of the front pair on this one) and carries it home (she may also drink its blood herself). Blue-green in mandible and claw

Probably, several paralysed spiders are interred in each teardrop-shaped cell, and she lays an egg on the body of the last one before sealing the cell. The bodies provide protein for the growing larva, which emerges as an adult the following year and will never meet either the mother who provided for it or its own children