You are looking for a small lock top container. The cache is situated just off of the main footpath. This footpath is heavily used by muggles so some stealth may be required.
To reach this cache you will first have to walk through the newly acquired area of Swan Wood. If you're in the mood for a walk I would recommend visiting the larger part of Swan Wood on the opposite side of the road, it makes for a fantastic stroll and you can grab a few caches from the Rio's Ramble series along the way.
After entering the woods you can either follow the path to the right, or the path down the hill and follow them down to the cache site.
Be careful accessing the cache as there are some thorns around the cache, but it should still be fairly easy to get to.
Swan Wood is an ancient woodland with a huge variety of trees, plants and animals. During the spring time bluebells cover the woods, making for a beautiful view. While in the summer dense foliage encases the woods.
The woods themselves are hundreds of years old, and medieval wood banks can still be seen clearly along of it's its winding paths.
Throughout the year many kinds of birds and animals call swan wood their home, regardless of the time of year of your visit it's likely you'll spot a few of them!