The inquiry will hear from two men who were at the very top of running the Post Office at the height of the prosecutions.
Alan Cook was a managing director and on the company board, while Adam Crozier was the Chief Executive of the Royal Mail Group which owned the Post Office.
Victims of the scandal have asked why Crozier hasn’t faced more scrutiny. He says he had no involvement in the Horizon issue while at Royal Mail.
It’s interesting that he’s only being questioned for an afternoon – compare that to former CEO Paula Vennells, who will be grilled for three days in May.
Does that mean the inquiry is less interested in what he has to say than campaigners had hoped?
Of course, there is no such thing as a quiet day here. Even when the evidence is at its driest, its most technical, it is quietly devastating.