You are looking for a small (6 cm) container hidden in the trees off the tennis courts.
This cache is a great one for all the family as there are tennis courts, 2 playgrounds, mini golf, a big field, a café, volleyball courts, a running track and some caches! This park is where the queue for Wimbledon tennis takes place. You should come with 1 - 2 hours to spare on a nice day if you want to use some of the facilities in the park.
Good luck and happy caching!