A couple of minutes later, they are at it again. This is the male going inside the nest box.
Here he is inside a second later.
He tries to attract the female to come to the box by "flashing his white cheeks at her" to quote something I have read - but can't remember where!
A bit later, she arrives on the nest box hole.
Still inside the box, the male seems to be saying something to her.
Perhaps it was "Look out, I'm coming out!"
If it was, then the warning was in vain - again the female is nearly knocked off her perch as the male leaves the box.
"What's the hurry?"
After a few seconds, the female does finally does go inside!
She also has a quick look around her.
She doesn't stay long though. Fifteen seconds after she enters the box, she is away.