Happened to me and a few mates up at county hall in worcester, we're planning to write a letter to the council saying how any damage caused to these walls would be significantly less than the cost of them having to build us a trials park, problem is theres not enough riders in the area to get them to build one so they tell us to go to the skatepark instead. Simply because they don't understand why we do what we do. if i were you I'd get as many people to sign a petition as you can, I'm sure theres a website that can help you with this- for the mean time just ride there anyway, if you get chucked off, s**t happens. Oh yeah and they cant make you leave without a court order, as long as you aren't! causing damage. (even if its private property)