As Backgren sad it´s in gothenburg, sweden. It´s still open for trials even if the site dosen´t tell anything about it. The place is manly open for bmx, skatebord and stuff but we trialriders have our one part too. The place is unfortuneli closed at the moment and only thoose who got the keys can enter.
Talk to Backgren about it, he seems to know how to get there good from england.