Re: Talk is cheap, where's the £?
The answer to that is "Yes they did know" , according to that ITV drama they had teams of people manually going through postmasters accounts at night secretly correcting the errors the system had put in.
I believe thats not just a dramatisation / poetic license thing .
I wonder if the crisis was limited to Fijitsu UK though , and the CEO in Japan found out only recently , but I guess with this dragging on for 20 years they surely must have herard something in the press if nowhere else.