According to the actress, she hasn't seen the finished product yet, but she did chat about making it. In the film, she plays the wife of a senator and the close, socialite friend of Woody Harrelson's character. When her lover is murdered, Harrelson helps her at the expense of his own stature and personal safety. Scott Thomas says that her character "is frustrated that she has become an accessory. She wants to be a normal person and be loved, and get back what she sacrificed for her husband's career." Basically, everyone is "lying all the time. That's what drew me to it -- the idea of that double life, the weight of secrets. Lynn has to keep going whether she's terrified or heartbroken; she has to maintain her facade and hold things together. She's acting the whole time."
As for Scott Thomas herself, she is infamously known for the wall between her work and her personal life. I imagine that this is what leads to what Ryan Gilbey describes as "playfully combative." When asked about the film, she first said: "I haven't seen it... There's not much point me talking about what the film is anyway, because I have nothing to do with that. I'm just the raw material." The spunk may be surprising, but it's what's made her career, especially in films like Four Weddings and a Funeral and Gosford.