This one is where border crosses the busy A14. There is a farm access here but it's not really a safe place to be pulling off the road and looking around for 35mm pots under bricks at bases of trees. So this one is a Puzzle cache.
Don't fret though - it's not a difficult puzzle and parking is about 200 from GZ. Just find the year below and plug it into the equation.
Huntingdonshire lost it's county status in ABCD
The cache can be found at N52 22.(2xA)(2 x A)(B - A) W000 27.DCB
A black tube with room for small swaps and trackables