Yet despite Schumacher's unrivalled success, Stewart is reluctant to class him as the greatest driver of all time.

BBC: Michael Schumacher and the Ferrari prancing horse emblem

Can Lewis Hamilton become the best F1 driver of all time?

CNN: The man behind Hamilton's F1 dream

As Ferrari's star driver, Mr. Schumacher won four world championships, set the record for the most career Grand Prix victories and cemented his place as the greatest driver of all time.

WSJ: Petrol Heads

"We felt confident enough in his ability and potential to appoint him to the role of reserve driver in September and since that time his development has been rapid in all aspects, " Booth explained.

CNN: STORY HIGHLIGHTS

Recognising the potential danger of that situation, governing body the FIA has said that all laps in qualifying must be completed within a specified percentage of a driver's fastest time.

BBC: Bahrain qualifying - as it happened