7 May 2014 Last updated at 06:47

Murray Walker's F1 report card - who is top of the 2014 class so far?

Formula 1 commentary legend Murray Walker gives his thoughts on who has performed well and who has struggled in the 2014 season so far.

Walker awards two teams 10 out of 10 after the first four races, but says three of the big constructors must do better.

Available to UK users only.