There is video up of the Silverstone dynamic events.
http://www.playitback.org/details.aspx?v=184
It looks to me like the accel run is short. The course extends almost exactly 4 grid spots. Videos from previous years event show the course covering almost 5.
http://www.youtube.com/watch?v=F9HXrWDS2nI
Is the grid consistent? Did something change from last year?
estimate 7 m error at 32.5 m/s
8 m / (32.5 m/s)= 0.22 s