The cache is hidden on the route of Portway, an old Roman road that ran from Old Sarum (where there is also a cache) to Calleva Atrebatum (where there are two more caches).
There is a free park at N 51 21.117 W 001 07.379, but it is very muddy in the winter so try N 51 21.162 W 001 07.305 where there is limited parking. The hiding place is near a footpath which gets muddy in places in wet weather so take some wellies.
The cache is a small ammo box containing the usual goodies.
Please check out the Geocaching Association of Great Britain
offering support for Geocachers in the UK