Is it drivers who have driven less than x race-speed laps of the circuit, so they are forced to run them during pratice/qualifying or don't get to drive?
the answer is "someone who has not raced in the last 3 years" hence Guy Smith (winner in 2003) having to take the Rookie Test (10 laps on test day) this year.
Truckosaurus, you have won a lemon! I had no idea since I thought it was possibly someone who hadn't done his/her 10 laps. Interesting quiz night question for the future though!