James Allison insists F1 cannot say whether Fernando Alonso, Lewis Hamilton or Sebastian Vettel is the best as the trio have never been in the same car.

It is an age old debate that will continue to rage as to who is the best driver in Formula 1.

At present the sport has three greatest competing in Alonso, Hamilton and Vettel.

While the Spaniard has two World titles and three near misses on the board, Hamilton is chasing his fourth and Vettel already has four to his name.

However, which of the three is the best.

“I get asked this question a lot and it’s a frustrating question,” Allison, Mercedes technical boss, said.