Williams' chief technical officer Pat Symonds believes the team has developed the third fastest car this season.

Willliams slipped back behind Ferrari to fourth in the Constructors' Championship following the Hungarian Grand Prix recently, and now trails the Scuderia by 7 points, 135 versus 142.

The Grove squad, however, has taken three successive podiums this season - with Valtteri Bottas third in Austria, and second in Britain and Germany. In contrast, prior to Hungary, Ferrari had only managed one rostrum, although Fernando Alonso did of course make it two after finishing second in Budapest.

Asked though, if the Williams' form is track dependent, Symonds told the official F1 website: "There is an element of it - always has been, always will be. Our objective, however, is to design a car that works equally well on all 19 circuits, but none of us achieve that, not even Mercedes."

"Don't get me wrong, I do recognise the differences for us at places like Austria, but I still believe we have the third quickest car, and if we use it and develop it properly we will be third quickest at most circuits," he added.

"It is very close this year - no one will say anything other than Mercedes is the best car, in my opinion Red Bull are second, and then you have Ferrari, Force India, Williams and McLaren. That is quite a tight bunch, (but) arguably we have the third-best car at the moment."

Symonds also added though, that having the third best car, doesn't guarantee the team third place in the Constructors'.

"What makes it difficult this year is that 43 points are taken by Mercedes at pretty much every weekend, which means the rest of us are fighting for a lot less," he continued. "The difference between finishing third and sixth overall might be quite small.

"If we are the third-best team, we ought to finish third in the championship - but in 2005 [when I was at Renault] we won the championship with Fernando Alonso despite McLaren having the better car. We were a better team and we won by our racing."