This weekend's Spanish Grand Prix saw Ferrari slightly modify their SF71-H, in which the rear-view mirrors were moved up and mounted on the halo.

The halo is a new safety feature brought in this year in the Formula 1 cars, which is believed to ensure greater frontal head protection. Although the controversy is surrounding the mirrors on the halo, which, after complaints from Scuderia's rivals, was deemed to provide an unfair aerodynamic advantage to the car, as well as freeing up space for improved airflow to the sidepod.

According to Sky Sports, the FIA has since ruled that the halo-mounted mirrors breach the post-China regulations, and therefore FIA race director Charlie Whiting and technical delegate Jo Bauer who were investigating the design over the course of the Barcelona GP have now banned the mirror concept.

The FIA also understand the difficulty in reverting the mirrors back, and so for the remainder of this weekend's Grand Prix, Ferrari will be using their older-spec car, as of the Monaco GP and onwards.

Red Bull boss Christian Horner said: "I don't think you'll see them at another race, that's my understanding."

While Sebastian Vettel claimed the mirrors were purely for visibility purposes, but it is the extra winglets incorporated in the design that are breaking technical regulations.

As regards who will win the Spanish Grand Prix, its looking like Mercedes' Lewis Hamilton is the bookies' favourite, at 11/8 with Ferrari's own Sebastian Vettel in second favourite at 9/4, despite the 'upgrade' of the halo-mounted mirrors.

The practice sessions suggested Mercedes had slightly better pace, however, there has been a suggestion Ferrari have been holding something back for the rest of the weekend.

We will have to wait until the end of the weekend's Spanish Grand Prix in Barcelona in order to see just how much the mirrors will have an impact on Ferrari, and the final standings.