There is parking for a couple of cars alongside Nursling Church at N50° 56.789 W01º 29.366 (SU 359164); you can drive past the church to turn your cachemobile round, but please don't try to park any closer to the cache than this. For a longer trek, park at any of the many access points to the Test Way (check the web link above).
The church is dedicated to St Boniface, who was a novice monk at Nursling (Nutshalling) Abbey (which has long since disappeared). He travelled as a missionary to Germany, where he upset the locals by chopping down an oak tree they were worshipping. After he died, a fir tree grew on the place where the oak tree had been, and the locals came to associate the fir tree with Christianity - the origin of the Christmas Tree. St Boniface was also known as St Winfrid, and there is a church dedicated to St Winfrid near the start of the Test Way in Totton, 3 miles walk away.
Have a look around the churchyard, where you'll find many interesting memorials, then follow the Test Way until you find the cache! On the way you'll pass a huge "Private" sign, but this only applies to vehicles: The smaller sign below makes it clear that this IS a public footpath and bridleway. Near the sign you'll hear much barking of dogs: It's a boarding kennels, they're noisy but they're all secure.
The cache is a green ammo box containing the usual bits and pieces, including a camera: Please take a picture with it and return it to the cache. Pictures from the first cache cam are here.Good luck and enjoy the walk.
Other caches hidden along the Test Way include:
(Note that there are probably others, but I've only listed those which I know from personal experience to be achievable without straying far from the path. Also, none of these is within an easy walk of this cache, I'm just showing them because the Test Way is a nice path and they're on it!)