This is the female egg laying in the early morning.
I checked the nestbox early morning and in the evening. Some evenings there was another egg being laid. At the time I assumed that it was the same female laying twice a day but current research suggests that it was probably a second female laying in the evening. Normal clutch size for the Eurasian Blue Tit is seven or eight eggs but as you will see later, there was a lot more eggs laid in this nest.