Box? What box? Mystery Cache

[Text in square brackets is not part of the clue.

This cache is NOT located at the published coordinates or at either of the waypoints.

None of these points are helpful for parking.

The published location is a point you will probably drive past if you come via the A47 from either east or west, you'll find one of Satnav in a kilt's caches nearby, two for the price of one!]

[A bit like a cryptic crossword, pretty much every word is part of the solution.

Submit coordinates within 30 metres of the final location and geocheck will give a straight clue for the final location.

Congratulations to Disa-urq and Theurqs for FTF. I was starting to worry that I had set an impossible puzzle!]