appears to be unscrupulous high up post office managers who knew there was something wrong

Someone saving their skin, and maybe a backhander over original installation. In one case a man went to jail and has since died. Imagine the penury, suffering, and implied shame when you know you are innocent.

In the early days of businesses discovering PCs quite a few firms used them to dispense with one employee, one reason they were employed being as a check on the other's integrity. Managers saw the job as computation, not security. Basically not reading the whole job specs long after they were devised.

My belief is in human nature. All of it, the kind, the young cyclists who say thankyou when you stand aside, and the greedy, and the stoopid. I believe in them because it arms me when I encounter the less rewarding aspects. And I entuse in responsible yoof - it gives me hope for mankind. Ooer, philosophy.