Here Barney does an exit and an immediate turn about to land back on the nest box hole!
Sunday 15th February
I think I've got the camera adjustments sorted again now, so here's a few more pictures.
Another visit from a great tit.
He seems to be taking a close look inside ....
.... but again decides that it is not for him - perhaps he can tell without trying that the hole is too small for him.
The hole is 11/8 inches across (28.6mm). That's OK for a bluetit but too tight for a great tit which needs 1¼ inches (31.8mm). It's also protected by the metal plate so theoretically it can't be pecked bigger!