Controversy did affect Button

Although he remained a frontrunner during the six-race period overshadowed by what became known as the 'Buttongate' furore, Jenson told autosport.com that in hindsight he reckoned the contractual controversy did have an adverse effect on his form.

"I didn't feel any different when I was driving the car, but I am sure it didn't help the situation. In the back of my mind I was worried about it and thinking about it, but having a clear head this season will help a lot more," he said. "To be focused and more at ease with the team, that's always better.

"The team has been fantastic over the winter, they've worked really well to put a good package together and have a good car from the start of the season."

Williams announced prior to last year's Hungarian Grand Prix that they had signed Button for the 2005 season, but his employers BAR contested this claim and took the matter to the Contract Recognition Board. When the CRB ruled in BAR's favour in November, Button was bound to drive for his present team for at least another season, while Williams was forced to begin searching for an alternative partner for the already-signed Mark Webber. The team has yet to make a final decision between contenders Antonio Pizzonia and Nick Heidfeld.