Of course you need to learn DR, but GPS is a fact of life and it makes aviation safer. It is a near unbelievable, superb aid to basic navigation. It is far more accurate and easier than radio navigation, not to mention a damn sight simpler and less time consuming. You can still infringe, but it sure as hell helps in those dodgy situations where you're not quite sure which town is which and you're wandering around close to CAS.
The CAA chooses to ignore it completely. How does that improve flight safety? How does it improve flight safety to send PPL students off without the best, simplest aid to navigation ever invented?
QDM