In reply to cloughs1:
If you're looking for an easy and fun way to improve your navigation (including an understanding of contours) considering trying out orienteering and possibly joining your local club.
Your local club is the Saxons Orienteering Club (https://www.saxons-oc.org) and, from a quick look at their website, appear to be quite active with a few upcoming events just outside of Sevenoaks. Events are well worth going to as there is usually a wider range of courses, and higher quality and therefore more fun, than most permanent orienteering courses that you might come across. There are also people there who will be more than willing to show you the basic and who can help you figure out how to improve the next time.
Orienteering doesn't take too long, doesn't need any specialist equipment except a compass to begin with and you won't have to travel too far. It can easily be a half-day or evening activity. These days more are more mountain navigation is taught through the medium of orienteering as it allows quick feedback and the opportunity to practise a lot of skills in a short amount of time. Instead of travelling 10 minutes before something significant changes on the map, you're making a few navigation decisions every minute. The maps are much more detailed, and the way the sport is coached is all about building confidence.
Orienteering is a running sport, but it's incredibly welcoming and if you say you only want to walk around no one will blink an eye.
Hope this helps,
Mehmet
Post edited at 17:08