Lewis Hamilton came within three thousandths of a second of setting the fastest time of pre-season testing on the final afternoon of running, as Mercedes finally showed a real turn of pace. But don't be fooled by that. Ferrari still has the edge. Ben Anderson is joined by Edd Straw and Tom Errington in Barcelona to discuss why Mercedes still has some work to do, how the last two days have made Red Bull-Honda's status less clear, and what Robert Kubica's final-day reaction says about the mounting woe at Williams.