It's not the 'computerisation of patient data' that's the problem (I mean, have you seen the paperwork the keep at your local GP), it's 'keeping it all in one place' that's the problem. It introduces single point of failure problem - if it goes wrong, everyone suffers. It provides a single attack point for hackers / insurance companies / etc. It takes control of personal information out of the patient's hands entirely.
A much better solution is to have patient details stored at the GPs surgery and define a framework to allow other GPs, hospitals, A&E departments and so on to access the data. GPs would then be involved in the patients data access providing an extra level of control over the data.
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