On balance I think that labelling of removeable mains leads e.g. IEC mains type, on a batch-basis (location, purchase date, etc, etc) perhaps, is probably necessary and a more practical method of proving that leads are being visually and/or electrically safety tested. Tracking of individual mains leads is probably not a practical option unless leads are permanently attached to the device they're used with, individuals have lots of time on their hands or there is a really good tracking system, already in place, that works. Seems a shame to have high quality systems and methods in place to test the medical kit then ignore a significant source of risk presented by faulty mains leads that are not inspected/tested/managed in a methodical manner.