Park at the Wren's Nest car park (N 051 19.180 W 000 28.177) near to the RHS garden. Nocturnal cachers should note that the car park is locked at dusk. Since placing this geocache a parking charge has been introduced at Wren's Nest. An hour should be plenty of time to find this cache and get back to the car park.
Follow your wildly varying GPS (sorry about the trees). It may be rather muddy underfoot, especially after rain. In Summer please watch out for nettles.
If you visit this cache on a Sunday morning or a sunny weekday evening, you may be fortunate enough to see a group of toxophilites practising their art - hence parabolic flight! Do not approach too closely or you may get full of holes - stay off the field. You may safely watch from the gate at N 051 19.484 W 000 28.192.
Another point to note is that the RHS Wisley gardens are open to 'members only' on Sundays, but anyone else on the other days of the week. The shop and plant centre are open to the general public every day.