Dear Pete & Anna,
Thanks for your post. For no apparent reason all the Yahoo groups to which I've subscribed have stopped sending and receiving emails to/from me!
Badger numbers have increased in recent years, and what you have seen has probably been their work.
While I was away last week, someone let me know that chicks have been seen in the barn owl box. So, yes, they have bred this year! We are surprised, because the nest was checked on 18th July and we found the first moulted feathers. They don't usually start breeding after they have started moulting. I saw two large but still downy chicks today.