What I remember is its UK made, one american actress. A group of friends in mansion, lots of drugs and sex, really bizarre plot. People end up dying. Theres one guy whos studying denistry. There a serial killer cult all over the tv news. I remember a picnic scene and a cow or bull. I feel like it was a cross between the Young Ones and Trainspotting? Been searching for years, asked all my English and Irish friends they have no idea?