" Jackdaws are very determined. Some other pots around have a wire netting sort of cover but they're a bit ugly to look at. It only happens at this time of year"
Hurdity it would be better to get the chimney covered. One year a couple of birds got in our chimney and built a nest.
The first we knew of it was when the fire wouldn't draw and smoke billowed out into the room. No problem we thought, get the sweep. It took him ages to remove the nest material (2 bin bags). Also, some eggs had been laid, a horrible situation, chicks were too young to survive.