The FIA has officially confirmed Honda used three of its allocated 'tokens' in upgrading its power unit during the summer break, leaving it with just four to spend for the remainder of 2015.

Having started the year with nine available tokens for in-season development, based on an average of tokens not used by rival teams prior to the start of the season, Honda used two ahead of the Canadian Grand Prix and spent a further three more ahead of this weekend's Belgian race.

As a result, it has just four more to use over the remaining eight rounds.

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As well as Honda, only Ferrari has used tokens for in-season development so far and has seven remaining, while Mercedes and Renault haven't introduced any significant upgrades. They have seven and 12 tokens respectively, though Renault has indicated it will bring a major upgrade ahead of October's Russian Grand Prix.