Go catch: I'm now hearing far too frequently in the online comments that this area is being used as a toilet, therefore I've decided to archive this cache.
The idea was to bring people to an area where the public/cachers can see the Mini car being tested on the plant test track. Unfortunately, as the area is left overgrown so much nowadays, it appears that it's more useful as a toilet stop and I'd rather not encourage anybody to this type of area.