The cache is not at the listed coordinates, they will however lead you to a 'powerful' door displaying two numbers that will help you locate the actual cache.
The two numbers should be 5 digit (ABBCC) and 10 digit (DBDD CEF GEF).
Use the following formula to calculate the coordinates of the actual cache.
N 53° 47.(B)(E)(C+G) W 1° 33.(G-A)(F)(D)
The Power Beneath Us and the start location are all connected to the Electricity Network via tunnels beneath the street of Leeds.
23.12.14: Difficulty upgraded to 3.5 due to high visibility of location - ninja cache finding required!