The route didn't disappoint, with beautiful views (making you forget you're just an hour drive from central London), good climbs and descents mostly across woodland. As mentioned in the other reports, you have to stay focused on navigation and look around. I made a few wrong / missed turned, made trickier given some paths were literally hidden and/or well overgrown but managed to get back on track relatively quickly. The route is not marked and the gpx can be slightly off at times. But that's part of the fun with this route, and you never know what comes next making it really interesting.
I was carrying a hydration vest, which was well needed given it was a warmer day, and used 3 gels.