Guess who's back - Overnight roosting

The birds pop in and out of the box during the day and one usually arrives to sleep between 4pm and 4:45pm UK time. It has been staying in the box until about 7:30am. UPDATE Friday 21st Jan: During the evening of Tuesday the 18th of January a cat paw appeared through the entrance of the nest box. From the angle of the paw it was apparent that the cat had managed to climb the tree and get on the roof of the box. Since that night the bird has not been sleeping in the box. Was that to do with the fright or that the temperature has gone up? No one can know, The birds have been popping in and out of the box during the day so don't worry, they're still around. To try and stop this from happening again the box now has anti-cat spikes on the roof. They're not needle sharp but they are strong enough and long enough to deter a cat (hopefully). They should also stop magpies and the like from hanging out on the roof of the box as well. The birds will not start to build their nest for another few months yet. Pinned com