All subpostmaster convictions have now been quashed, but many people went to prison or lost their businesses.
The Swift report was commissioned by the government following a BBC Panorama programme in 2015 that raised concerns about the strength of evidence against those convicted.
Although supportive of the Post Office in parts, it raised key concerns about whether the Post Office had enough evidence to bring charges of theft.
It also cast doubt over claims that Horizon data could not be altered remotely by Fujitsu, the company that developed the software.
This turned out to be untrue, and may have deprived subpostmasters of an important line of defence at their trials.
Mr Parker, who became chair of the Post Office in October 2015, and remained in the role until September 2022, told the inquiry that top Post Office lawyer Jane MacLeod had advised him not to share the Swift report because it was legally privileged.
That meant it had the same confidential status as communications between a lawyer and a client.
Mr Parker said he was told that breaching this could have resulted in the report being made public, and that it needed to be kept within the “tightly knit” Post Office legal team.
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