Both Alonso and Button have already used their fifth engines of the season, but the FIA's World Motor Sport Council ratified a regulation change that means new engine manufacturers in F1 are given an extra power unit for use in their first year.

Honda was thus granted a 'free' engine that will allow Alonso and Button to start the Hungaroring weekend with a fresh unit.

Since it is the 'free' engine, no driver will be penalised for the change.