There doesn't seem to be any point in having a chimney that serves no purpose other than being decorative. It's a liability. But here it is on one of the new houses in Tingewick. Where wood is a practical fuel that is easy to obtain.
If I hadn't noticed the feathers on the ground I would have missed this nest by my back door.
The nest is on top of the outside light. If you look closely at the second picture you can see Mrs blackbird's tail. I put my phone about 8 inches away from her and she stayed perfectly still the whole time, trusting her camouflage.