There were four eggs this morning at 5:30am when I checked, keeping true to the 'one-a-day' laying schedule so far. At this time the male bird was calling outside and the female left for a short while before returning to sit on the nest. While she was doing this the male flew in and out feeding her caterpillar grubs several times as he did last night. Later on she left the box and currently (9:30am) the four eggs are in full view.
Minor Update 1:
Crikey she's been busy this morning! When I last looked at 9:35am the four eggs could be clearly seen - now at 9:54am the nestbox is absolutely full of feathers!
Minor Update 2:
Today's four eggs at 5:19pm this aftermoom - a much clearer picture than the one taken this morning.