Paula Vennells will face questions from subpostmasters in her final appearance at the Post Office inquiry.
The former chief executive, who held the top role between 2012 and 2019, has already given evidence for two days on her role in the Horizon scandal.
More than 900 subpostmasters were wrongfully prosecuted after bugs were incorrectly recorded on their branch accounts.
Yesterday the inquiry heard how Mark Davies, former PR chief at the Post Office, advised Ms Vennells that reviewing too many past Horizon cases could make the issue “front page news”.
Inquiry chair Sir Wyn Williams is also expected to provide an update on Jane MacLeod - an ex-senior Post Office lawyer who is living abroad and refusing to cooperate with the inquiry.
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