Resisting Red Bull would be 'great' outcome for F1 2016 - Williams

Williams finished third in the F1 constructors' championship for a second successive season last year, despite only having the fifth biggest budget.

"We need to cut the gap down to Mercedes and Ferrari," deputy team principal Williams told Autosport.

"That would be a real achievement for a team like us when our resources aren't as strong as some other teams.

"If we can keep the Red Bulls behind us as well, it'll be an even greater achievement."

The team's last win came in the 2012 Spanish Grand Prix but Williams believes its performance in Britain last year, when Felipe Massa and Valtteri Bottas ran one-two, proved the team is capable of ending its winless run.

"The ambition at Williams is always to win races and fight for that title," she said.

"We've had two years of finishing third and we have to make performance improvements and take the fight to those at the front.

"We should all remember how amazing it was to see our two cars go into that first corner at Silverstone in the lead after overtaking the Mercedes.

"It was brilliant to see two Williams do that, particularly on home soil and I will never forget that race.

"We proved in that one race alone, in those few laps, that we are back as a team.

"For the team itself, that is a motivation point to remind everyone what it feels like to do well in F1 and to be successful and to lead a race.

"It was very motivational for everyone and it helps a lot."