Eleven of forty boxes occupied, which is genuinely a good result
The numbers
Forty boxes over six years, eleven currently occupied, and three more used by kestrels. That is at the good end of what is typical.
What limits it
Rough grassland within about a kilometre. A perfect box in the wrong place stays empty for a decade, and habitat is the harder problem.
What is needed
Landowners with rough grass margins, and two people willing to learn to check boxes under licence, which takes a season.
