Hi, I have a small garden, with one nestbox up for the last 9 years. The first six years, blue tits successfully used it. But the seventh year, a cat sat atop the shed killed one of the parents, and the other abandoned the eggs. The following year (last year), the nestbox wasn't used. This year, although there are blue and coal tits in the garden regularly, I haven't yet seen any birds investigating the box. Can I assume that it's too late now in the season, i.e. that if birds haven't investigated by now, they're not going to? I just want to know so that if it's really too late, I can stop staring out of the window anxiously....Thanks in advance.