McLaren granted additional engine for 2015 season

McLaren's Fernando Alonso and Jenson Button have been granted an additional engine each without penalty following a change to the sporting regulations.

During Wednesday's Strategy Group meeting, it was agreed that all new engine manufacturers should be granted an additional engine on top of the standard allocation "for the sake of fairness".

The FIA has allowed the decision to be applied retroactively to McLaren's engine partner Honda, meaning Alonso and Button will be allowed a fifth unit without encurring a penalty.

The pair have already used a fifth unit each in Austria where they faced 25-place grid penalties as a result, but the new unit is now available to them to use from the British Grand Prix if they require it.

In addition, the FIA also stated that the price of engine supply to customer teams would be investigated further along with other aspects such as fuel allowance and development tokens.

It could mean that they will place a cap on the cost of a deal, which for most customer teams is around £15 million ($23m).

"Mandate has been given to the FIA and FOM to propose a comprehensive set of measures for power unit development and cost of supply," the FIA stated.

"This will include full review of the token system, increase in race fuel allowance, limits of the usage of engine dynamometers etc."