A group of yellow silken tubes, attached to the outside of a window. The caterpillar to the lower left is unrelated. What made them?
No interactions present.
Donald, you could try to rear them through. If possible keep the remains of the host as well. I can give you a contact at NMS or NHM for ID when the wasps emerge if you want.
It's actually Barry who's posted the photo, though I agree it would be interesting to know what the wasps are.
Sorry Barry, same applies. B.
I'll see what I can do - I assumed they had already emerged. The caterpillar was a white butterfly of some kind, some of them successfully pupated.
If they have holes in them the yes. If not carefully lift them away from the substrate, the edge of a Stanley knife blade. Keep them outdoors over winter in a box (not plastic where they will rot), away from pests (mice). Bring them in in the early spring and keep in a sealed box but with plenty of air supply, but no escape. If you're lucky you should have a bunch of tiny wasps that you can pass on. If you want to try let me know and I'll get you an e-mail address of somebody to ID them.
Lat/Lng: 53.8, -3.1
OS grid ref: SD3135