There is no cache at the published co-ordinates, although you may find this a convenient place to park for a pleasant walk to the final cache location.
This is the bonus cache associated with the Chasem Crew's 'Quirky' series.
Each of the members of the Chasem Crew designed their own cache - three of which are positioned in Weybridge and three in Laleham. The bonus cache will require you to have found all six caches and note the GC code attached to the log in each of the caches.
The puzzle is not designed to be too tricky and the difficulty rating is mainly due to the work involved in finding all six of the caches in the Quirky series.
Once you have located all the 'Quirky caches' and made a note of the GC codes attached to the log in each of the caches you will then need to solve the following puzzle in order to locate the bonus cache:
Each of the GC codes that you have noted are other caches owned by the Chasem Crew. You don't need to have found all of these caches but you should look at the titles and see what they all have in common. Once you have identified the theme, you should have a list of six words. Take the first letter of each word and convert it to a number. The cache can then be found at the following co-ordinates:
N51 (C+M).(M+E-A) H (S+H)
W000 (C+A).(M+H) (S-E) (E+M)
You can check your co-ordinates here: