Cosworth boss Mark Gallagher says the development of the V6 engine rules restrict the development costs much more effectively.

Gallagher: "We also have a customer guarantee. Ferrari, Mercedes and Renault have committed that at least two customers will stay with us. Three would be ideal."

Cosworth is hoping to sign a third team and some believe that it might be Force India, or the team currently known as Lotus Renault GP.