Actually, the issue is not with the map per se. I was using OSMAnd app on iOS and using its navigation to the Abbey Wood campsite. It sent me here and it looked like it should have an path into the campsite.

I ended up cycling up and down a dangerous road looking for the entrance that didn’t exist (blind corner on a hill on a fast country road.)

So the problem is that Navigation in the iOS OSMAnd app should navigate to the entrance of ‘Abbey Wood Motorhome and Caravan Park’, not to here.