There is nothing at posted coordinates other than the Little Bridge at the entrance of Bishops Knoll. To find the coordinates for the cache complete the step grids puzzle below:
Once completed, label the squares A1-A28, E1-21, I1-I21, O1-O28, U1-U21 (going across and then down) and work out the alphabetic numbers of the letters residing in these squares:
N51 2 (A26 - O8) . (E10) - I16) (U8 - A14) (O19 - E14)
W02 3 (I8 - A17) . (U12 - E17) (U17 - U4) (O27 - I14)