For Williams the Abu Dhabi Grand Prix was a disappointing finale to a successful season. The British team have scored more points this year (34.5) than they have since 2005, but their ninth and 13th place finishes for outgoing drivers Nico Rosberg and Kazuki Nakajima at Yas Marina were far from representative of the FW31's pace over the course of 2009. Rod Nelson, the team's chief operations engineer, discusses what went wrong in Abu Dhabi and looks ahead to the winter break and 2010