I'm assuming the delay is them breaking the pillar two tests down for the first time.
I am a little confused as to the note, I thought daily figures at a national level were always all pillar? Is it that usually the pillar two results are delayed but that the delay is now such that it doesn't matter when looking at patterns?
"Number of people with a lab-confirmed positive test newly reported on Wednesday, 1 July 2020.
Data published from 2 July 2020 onwards for all areas include cases identified through pillars 1 and 2 of the government's mass testing programme (see below).
COVID-19 cases are identified by taking specimens from people and sending these specimens to laboratories around the UK to be tested. If the test is positive, this is a referred to as a lab-confirmed case. If a person has had more than one positive test they are only counted as one case."