Where in that article does the figure 556 come from? I can't see it, but maybe the whole article isn't loading for me.
Edit. Found it elsewhere.
1,570 new cases and 111 new deaths in the United Kingdom. "Additional deaths, identified from Pillar 2 testing in England, have been added to the data over the last week. In total 445 deaths have been added, with dates of death back to 26 April 2020"
So the extra 445 deaths occurred over a 35 day period, ie about 13 extra deaths per day.