In the new advanced, enlarged, improved, sensor equipped, over-kill, nesting box, nest building have finally started!
The Great Tit female with a spot on her head started carrying nesting material inside the box today.
I must check the other nesting box this evening to see whether "building efforts" are being undertaken in there as well...
In the old nesting box which I now hung outside my office window, a Blue Tit pair is busy doing what ever it is they are doing. The female Blue Tit sometimes carries material to the nest. Most of it is dropped before she enters. She spends much time inside the nest. It appears as though it is her first time and she is not quite sure what she should do hence the nervous moving moss-bits around.