Williams vows to make Cosworth work

Both Williams and Cosworth openly admit that the early part of the year has not produced the results they had hoped for - prompting rumours of friction between the two parties.

However, Williams CEO Adam Parr has made it clear that although there have been frustrations at both the team and engine suppliers, he was adamant the Grove-based outfit would make the effort to sort the situation out rather than simply jump ship.

"It is a marriage - and you have to work at it," Parr told AUTOSPORT. "You do have rows with your wife, but you know you have got the common interest and I still think that is the case.

"But we have no plans to change engine partner, and we have no desire to change engine partner. I just don't want to rule out the possibility of something happening because that would be a stupid thing to do."

Parr praised the work that Cosworth had done in the early parts of the campaign, and said that he was optimistic better results were around the corner.

"I think they have done an incredibly good job in terms of putting together an F1 programme with a pretty limited budget in a very quick order," he said.

"I think we've seen some very strong aspects - not only of the people there, the engineering quality but also the standards of the programme.

"Neither we nor them would say that we are satisfied with where Williams is competitively. You can't actually break down what is the route cause of that because we don't have comparable data on other people's chassis or other people's engines. But we are clearly dissatisfied with where we are as a team.

"It is our duty to ensure that at all times we have the best available equipment. I would say that we analyse all the time where we are, and I am not sure that anything exceptional is going on at the moment other than just constantly looking at where we can improve."

Renault has been making a big push to expand its customer supply deals for next year, and is understood to have held talks with Williams and Lotus about potential tie-ups.

Parr said, however, that the team's decision to go with Cosworth originally was partly fuelled by the fact that it could enjoy a closer relationship with an independent supplier rather than a manufacturer.

"One of the differences between having a relationship with an independent engine supplier, compared to a manufacturer, is that it is a much more symmetrical relationship," he said.

"If we have frustrations we can get them on the table. And maybe there is more ability to control our destiny with them and vice versa."