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Road directions
The the A226 towards Northfleet, when you get there turn into an unmarked road the Northfleet station side of Eagle Way, and park, this is an industrial estate, so parking can be tricky. You will see a palaside fence with a path alongside it, follow this under the North Kent Line and you will arrive at the footbridge.
Parking
As mentioned you can park nearby, and walk it. Not sure what the area is like, best not to leave valuables such as Sat Nav on display in there.
Public transport
Northfleet or Swanscombe stations and walk, not disastrously far!
Amenities
Ebbsfleet International Station is a short drive away which has toilets but little else. There are a few places in Northfleet however.
Accommodation
Rochester or one of the other Medway Towns probably best for this.
The location is good for light and videography at most times of the day. I went there late on a Saturday in November and had no major troubles. A Eurostar timetable will show the best times to be there from that point of view. As for light, its quite an open area with no problems that I could see.