Hatherley Court Gardens (also known as Court Gardens) is a bit of a hidden gem just off the busy Hatherley Road.
I couldn't find much information about this place but I guess it used to belong to Hatherley Court, the large building that you can just make out over the trees at the back of the gardens. If any cachers know any more please let me know in your logs.
There is plenty of on street parking on Hatherley Court Road. The cache is a magnetic key safe. The garden is popular with dog walkers so the hint is quite specific.