Force India were called to the Stewards office after the Spanish Grand Prix on Sunday after an issue was found with the positioning and size of driver numbers on their cars.

It is understood that the stewards were not happy with the visibility of the driver numbers on the sidepods of the two pink BLT Water-sponsored cars.

This follows a ruling that was implemented this month to make it easier for the stewards, spectators and race commentators to identify different drivers as they sped past.

Article 9.2 of the technical regulations now states that a driver’s number “must be clearly visible from the front of the car and on the driver’s crash helmet.”

Meanwhile, Article 9.3 also now states that the “name or emblem of the make of the car must appear on the front of the nose of the car and in either case be at least 25mm in its largest dimension. The name of the driver must appear on the external bodywork and be clearly legible.”

The FIA believe Force India’s cars are in breach of these two regulations.

According to, F1 race director Charlie Whiting is also understood to have sent out a letter to the teams, further explaining that driver numbers “should be at least 230mm high, and that the names should be 150mm, and on the external bodywork.”

Force India had their best finish of the season at the Spanish Grand Prix on Sunday, with drivers Sergio Perez and Esteban Ocon finishing fourth and fifth respectively.