We had an incident in Maternity which resulted in the lady making a complaint about the "delay" in getting her into theatre once the medical staff had decided the baby was showing signs of distress. The delay was about 20 minutes because another lady was already in the theatre having a section. When the complaint was investigated the staff were in a very difficult position because the time printed on the strip from the monitor sugested that the lady had waited 1hr 20min - because the time was wrong on the monitor !
I believe she won her claim for compensation on the strength of this evidence.