I Don't Blame You, So Would I...

Mr Butoy was arrested, charged and sent to jail for stealing £208,000. It took until last year to get that conviction overturned in the High Court.

But he doesn't feel like his ordeal is over yet. "People say you've had your name cleared you're all right now. But it's not, you want justice," he tells BBC News. "I want someone else to be charged and jailed like I was."

...but you must know it's never going to happen.

On Monday, 14 February, the public inquiry into the wrongful of conviction of 706 Post Office branch managers, like Mr Butoy, will begin to hear evidence. Those convictions are the most widespread miscarriage of justice in British legal history, and are now gradually being overturned in the courts.

Far, far too late for many. 

Crucially, it will ask whether those at software developer Fujitsu, the Post Office itself or even their biggest shareholder, the government, knew about faults in the system while using that data in court to convict sub-postmasters.

The answer cannot be anything other than 'Yes, they did.' 

One such expert, Jez Thompson, worked as a team leader for Fujitsu's Horizon Training Project, covering 60,000 Post Office branches over five years from the late 1990s....he also remembers regular glitches and bugs that made the software fail to calculate the books accurately.

"Occasionally it would work, but a lot of the time it wouldn't work," he says."Anything that was wrong with our system would be wrong on the live system as well," he explains.

"And we used to, on a monthly, probably even a weekly basis, pass information up to our managers just informing them that we'd found a glitch and this doesn't work. That's just the way it went."

"I reported them [these issues] to my line manager and he then reported that to a weekly meeting with Fujitsu Training Services, where both Fujitsu and The Post Office would have been present and glitches would've been discussed," he says. "Computers have reels of data. Somewhere there is evidence that somebody knew something."

I suspect that might turn out to be the wrong tense, Mr Thompson...