Former chief operating officer of the Post Office, David Miller, is back after giving evidence in phase two of the inquiry (which focused on the creation and rollout of Horizon) in October 2022.

He's being questioned by inquiry lawyer Emma Price, who's taking him through the various roles he held at the Post Office.

A key part of the inquiry will focus on his involvement in the delivery of Horizon.

He was appointed as deputy director of the Horizon project in 1995, before he became programme director in 1998.

Miller confirms this is all correct, as well as his role as chief operating officer - which came in the early 2000s.

Image source, Post Office Inquiry: Crown Copyright

Jacqueline Howard
Reporting from the inquiry

I'm inside the inquiry room, where David Miller is currently being sworn in to give his evidence. He was deeply involved with the rollout of Horizon in the 1990s and climbed the ranks of the Post Office in the years following.

Later, we'll hear from David Mills, who was CEO of the organisation during the time when many sub-postmasters were being prosecuted.

Stick with us as we bring you the key developments as they happen.

• On Tuesday, Former sub-postmaster and campaigner Alan Bates said the Post Office was being run by "little more than thugs in suits" in 2010 and accused the company of lying about its accounting system, Horizon
• Bates also told the inquiry that before he was sacked he had repeatedly raised concerns about Horizon, including in a letter he sent in December 2000
• On Wednesday, Sir Anthony Hooper, chairman of the Post Office's mediation scheme, said that the Horizon scandal was the "greatest criminal justice scandal that I have ever seen”
• Lord Arbuthnot, a former Tory MP and leading supporter of the campaign for justice for hundreds of wrongly convicted sub-postmasters, said he felt the government in 2009 refused to take responsibility for the issues the Post Office was facing
• On Thursday, former Post Office chairman Sir Michael Hodgkinson apologised "unreservedly" for the misery the Horizon software caused to sub-postmasters and sub-postmistresses and insisted problems with Horizon were not being raised to him or the board
• Earlier that day, David Smith, who was managing director of the Post Office for a time, apologised for congratulating the legal team behind the conviction and jailing of pregnant sub-postmistress Seema Misra
• And finally, on Friday, former Post Office managing director Alan Cook said he would "regret for the rest of my life" an email in which he wrote that sub-postmasters had their "hands in the till"
• That afternoon, former CEO of Royal Mail group, Adam Crozier, took the stand and said he didn't know the Post Office was responsible for prosecuting sub-postmasters

More former PO bosses in the spotlight todaypublished at 09:53 British Summer Time 16 April

09:53 BST 16 April

Emma Simpson
Business correspondent

Image source, PA Media

This week starts with another two former Post Office bosses. First up is David Miller. He's already given evidence to the inquiry, appearing back in October 2022 when it looked at how the Horizon IT system was procured and rolled out.

He joined the Post Office in 1970 as a management trainee. By 1995 Miller had moved to the Horizon project, becoming its Programme Director in 1998 - so intimately involved in Horizon's delivery.

The next year he became MD of the Post Office Network before moving on to become Chief Operating Officer. Miller will have known about the early technical problems with Horizon so what did he do with that knowledge when he got promoted?

Next we'll hear from David Mills. He was hired in 2002 as Post Office CEO. A former banker, Mills was drafted in to turnaround the business, staying until the end of 2005, but this was also a period when hundreds of sub-postmasters were convicted. What was his involvement?

We don't know much about either of these executives but they're in the spotlight today.

Sam Hancock
Live reporter

Today's Post Office inquiry hearing will get under way in about 10 minutes - and it's set to follow similar themes to the majority of last week, meaning it's more former bosses that we'll hear from.

Specifically, we'll hear from David Miller - a former manging director of the Post Office - and David Mills, who held the top job as chief executive between 2002 and 2005.

We're expecting Miller's evidence in particular to be interesting, as he was the PO's programme director of the Horizon project for a time - so questions from inquiry lawyers could focus on what we knew about the system's issues and when.

As ever, we don’t fully know what to expect from today’s hearing but we’ll be listening to every word and bringing you the most important details. Our reporter Jacqueline Howard is also in the inquiry room today, so watch out for her bits of analysis.