"Red Bull, McLaren and Renault have been very quick and they have shown their CARDS, while we are still hiding ours," he said.

“红牛、麦凯伦和雷诺很快，他们露出了底牌，但我们还有所保留，”他说。

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Renault is now officially in F1 only as an engine supplier - to Red Bull, Renault and Team Lotus - and now, through Infiniti, as a sponsor of Red Bull.

BBC: Red Bull get budget boost through Infiniti link-up

But Button emphasised that other teams also had their own new parts to introduce in Spain - among them Red Bull, Toyota, McLaren, Ferrari and Renault, the teams that filled the remaining points positions in Bahrain.

BBC: Button expects close title battle

Furthermore, writs that had been threatened against Ferrari and the other teams in Fota - McLaren, BMW Sauber, Renault, Toyota, Red Bull Racing, Toro Rosso and Brawn GP - are likely to be shelved.

BBC: F1 deal ends threat of breakaway