Took down some of these horrid plastic boxes that the old man had used as nesting boxes.
One actually had a nest inside from some time ago. The others just wet compost. Not that popular I guess.
They seem to be made from electric connection boxes, perhaps they came with all those concrete pylons from the garden?
I'll make some wooden ones instead. I don't want a plastic bird slum. You'll end up with square birds in these!