Hi,
I didn't know there was a website, but can help you out if you are wanting to visit?
There is parking at the edge of Hailey wood on the Stroud road, then you can ride in Hailey wood, or cross the road into the park. There is precious little parking around the park, best bet would be to approach a yard on the edge and see if they wouldn't mind you parking if you are boxing over? Bare in mind that the park is only open 8-5.