This one is a 450ml clip-lock box hidden in a quieter corner of the park along its Western side. Enjoy the short stroll up a gentle grassy slope and then into the woods. There are open views back down across the park to the River Bollin.
Approach up this slope...
... then past this gate (2011 picture, only the gateposts now remain) and left up into the woods.
See hint and spoiler picture if you can't find it.