Our favourite pictures from the Malaysian Grand Prix weekend.

Day 4 in Barcelona saw Kamui Kobayashi complete a massive 145 laps around Circuit de Catalunya for Sauber and finished the day on top of the timesheets, with yesterday's quickest, Pastor Maldonado only a quater of a second down on him.

Geoff Collins presents an insight into what goes into the launch of a Formula 1 car, with exclusive coverage of how the 2011 Marussia Virgin car launch came together