The nest building starts in earnest. Mrs. B spends all morning bringing in lovely springy moss for the underlay of the nest.

Mr. B. is bringing in food, which Mrs. B. happily takes while she is cleaning out the box. She has started digging the schmutz out of the drainage holes now.

The box has quite a lot of poo from last year's nest on the floor. Mrs. B. is clearing it out, but she also seems to be just chucking a lot of it around. A technique I have yet to try myself, when cleaning the house.

Mrs. B brings in some nesting material and chucks it on the floor before doing that flapping thing.

Mrs. B practices the flapping she'll be doing when making the nest. The technique involves bringing in some stuff and then flapping to spread it around.

Mr. B. does a typical bloke's attempt at cleaning - picking up a couple of bits of dirt before getting bored and leaving.

Mrs. B. comes and has a look at the mess on the floor, before hopping up to the door and giving it a damn good pecking. This is quite common with blue tits, and no-one really knows why they do it.

Starling attack! Listen to the starling (maybe) scrabbling around on the box. Look to the left of the screen and you can see a long pointy beak coming in. The blue tits avoided the nest for a week after this - maybe it put them off?

The first recorded visits of the year. Just a quick hop in and out to get a feel for the place. They will keep coming in with increasing regularity until the nest building starts, and it's all systems go!