Dont get a GPS you all ready have a map and a stopwatch this is all you need for VFR navigation.
Let's not go down this road again please! How many PPLs chuck away their license before it even comes up for its first renewal? Something like 90-95%. There are various reasons for this but a big one is that most of them are intelligent enough to realise they cannot get about UK airspace on the bit of string and a stopwatch which they've been taught to use.
There is nothing wrong with a GPS. A straight PPL (flying in VMC) can fly the plog visually while using the GPS for added accuracy, situational awareness, and general confidence that he is where he expects to be.
There are morons who don't do any planning and fly with a GPS but there will always be morons around. There are plenty of morons who run their tanks dry, etc. The only difference between a pilot who got lost doing things the "proper" way, and a pilot who got lost with a GPS, is that the former one might have been doing his best as he was trained, whereas the latter one must have made some really stupid cockup.