Lovely views over the M25!
If you cross the bridge you move out of London into Essex, be glad you're not in traffic. There are sometimes sheep in the field on the other side, so be careful with any GeoHounds.
There are plenty of bridleways and public footpaths in the area if you want to explore further, but this is the peak of Tinker's Trail. Don't forget to collect the co-ordinates for the Bonus while you're here.