Williams Technical Director Patrick Head has criticised the FIA for its investigation into Ferrari’s Bridgestone tyres, used at the Italian Grand Prix in Monza. The FIA took away a left front tyre and a right rear tyre and Head says that, due to the conditions at Monza, these tyres require a harder compound, while a softer compound would be an advantage on the left rear and right front. Had Ferrari been mixing compounds, this would not have become apparent, says Head, who described the investigation as “not very useful”.