Red Bull is working “day and night” to “uncover the secret” of how Mercedes pulled so quickly ahead in the otherwise intense 2021 title battle. In recent days, Dr Helmut Marko and his Red Bull Racing colleague Christian Horner cast serious doubt on the legality of Mercedes’ latest engine upgrade. “I don’t think Mercedes did anything illegal,” Marko insists. “We now have to work day and night to uncover the secret and then counter it as quickly as possible. But for the world championship fight, it is bad news for Red Bull. “Max constantly complained about understeer that we just couldn’t get rid of,” admitted Marko.

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