The best place to park for this location if you fancy a nice walk is the car park to the east of Kelmarsh village on the Brampton Valley Way.
You are looking for a large size cache which is an air tight sealed container, please ensure that you put the lid back on properly and use the clamp provided, I have found the clamp on the floor upon my last visit which could lead to its contents being lost see picture of clamp under images. Make sure not to move the o-ring once opened as you will never get the lid back on.
Please do not take pictures of the final location.