This is the 26th cache in the Birling Bash circuit and cache #20 in the North Downs series. For full details of the complete series and the three loops that make it up see TT01.
The published co-ordinates will bring you to an information board about bathrooms for birds(?) and a telephone number, 0800 ABC DEFG.
The cache can be found at N51 19.(A+2)(D-C)(F-1) E0 23.GB(E-C)