Adrian Sutil has just finished a busy day at the Force India factory, and he's on his way home to Switzerland when he answers my call at the airport. He's been talking to his engineers about the upcoming test in Barcelona, and discussing possible race strategy scenarios.

He has a couple of quiet days at home to come before he heads to Spain, where he'll take over from Force India team mate Tonio Liuzzi for Saturday and Sunday. Now the serious business really starts, and by the end of the weekend we'll have a much clearer picture of where everyone stands.