On one side of the bridge is a sign telling you you are in Gateshead M.B.C and the other side is a sign saying you are in County Durham - land of the Prince Bishops. On the bridge you appear to be nowhere - in no mans land.
The cache is a simple drive-by. On finding the cache spare a thought for those who didn't come home, enjoy the view, have a game of poohsticks.
If your family lost someone in the Great War, give them a mention in your log then they will forever be in cyberspace.