In a detailed official report on how the National Health Service faces deadlines, this bit of information appears.
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The British Standards Institute Year 2000 group has identified a problem with intravenous infusion pumps which give very accurate drug dosages to patients over a period of time. If these pumps are not recalibrated every six months they shut down as a safety device. At the year 2000, if the clock in the embedded computer chip is not year 2000 compliant, the equipment will assume it was last recalibrated 100 years ago and stop functioning. This could have serious consequences for patients.