France's centre Mathieu Bastareaud, centre, dives and scores a try during the Six Nations match against Italy at the Stade Velodrome in Marseille. Boris Horvat / AFP
France's centre Mathieu Bastareaud, centre, dives and scores a try during the Six Nations match against Italy at the Stade Velodrome in Marseille. Boris Horvat / AFP

Six Nations: Guilhem Guirado warns France improvements needed for England and Wales