In message , Andrew
writes

I thought the PO had such an appallingly badly tested computer system
about 15 years ago it lost transactions and the local PO staff were
being acused of theft, when they were blameless.

A very sore point for postmasters (even retired ones) and their staff.
Not 15 years ago, either. A major court case is ongoing. I enjoyed
running a local PO but dealing with PO Limited was an ongoing nightmare
and there was always, and I mean always, the daily worry that, at the
end of each day the books would not balance by some huge amount. I had
plenty of small discrepancies, and a few larger (hundreds rather than
thousands of pounds) but never a major disaster.
--
Graeme