The cache is at the posted co-ordinates.
A small container - BYOP - quick & easy find with a stamp - you'll have to bring your ink though.
Information regarding the park and full waypoints for the three car parks and the entry points are available on cache page : GC4AHJK 01 - St.Catherine's.
The caches are numbered to assist a cacher planning a route to nab them all.
They can of course be picked off individually - waypoints are given on each page for the nearest car park.