1.   But Dettori shrugged off the criticism and it appears the biggest question over Faithful Son is the race distance.

2.   He owns quarter horses - a breed trained to race short distances - and likes to shod them best.

3.   Early testing was dogged by technical problems and he only put in his first race distance at Silverstone last week.

4.   The rapidly improving Tyrrell Yamahas ran a successful race distance in testing last week, concentrating on reliability.

5.   The changes have been tested over several race distances, he said, and provided a significant improvement.