My owl nest box has finally attracted a tenant

Allendale, Northumberland Every now and then I hear the peep of what sounds like a single owlet, but I can’t be sureIt can take a while for owls to accept a nest box. My homemade wooden one was built to a chimney design from the RSPB website and set on a sycamore branch at the recommended 45-degree angle. My garden has a plentiful supply of voles, which are owls’ main prey. I have waited five years for one to move in.
For the past couple of weeks, the signs had been there: hysterical