Data protection rules should not be used as an excuse to prevent those with reasonable cause from having access to information which is unlikely to harm the person concerned.
An example would be refusal of an airline or the authorities at an airport to confirm that a particular passenger who is being met was on the flight or not.
A further expample would be the refusal of a mobile 'phone supplier to advise whether a better tariff might be available to another family member without that person being present.
This is jobsworth gone mad stuff. In both the cases mentioned those whose information was being 'protected' were potentially disadvantaged by the use of the DPA as an excuse to withold information.