Found this interesting web site, containing all the lap times that have been set by all the cars at the Dunsfold test track.
Since they only ever show bits of each lap, from different angles and cameras, including interior shots of the car, it’s always hard to visualise how the track goes, but the essential point that they don’t tell you that is illustrated by this map, is that the track is a figure 8 layout.
The fastest-ever lap of Dunsfold is an amazing 59.0 seconds set by the Stig in 2005 in a 2004 Renault F1 car.
Anyway, you can read all the details on Wikipedia HERE.