Webber laments stint at Williams

Webber joined Williams from Jaguar in 2005

Mark Webber ends his two-year spell with Williams in Brazil this weekend admitting he made "a costly mistake" in joining the team.

The Australian was advised by manager and Renault team boss Flavio Briatore not to sign for Williams.

Webber, who joins Red Bull next year, says he should have heeded the advice.

"Flavio was never keen for me to go to Williams and I know I made a costly mistake by not listening to him," said the 30-year-old.

"He was very keen for me to go to Red Bull next season, so I wasn't going to ignore his advice a second time.

"It's a joint management decision and one we all think is the best option for my career. We've rolled the dice so now we just have to see how it tumbles."

I think it's fairly safe to say I won't be looking back with any fond memories Mark Webber

Webber joined Williams from Jaguar in 2005 but has seen the team slip down the field to eighth in the constructors' title.

He is languishing in 15th in the drivers' championship after only finishing seven of the 18 rounds in the run-up to Sunday's season finale in Brazil, with a best of sixth in San Marino and Bahrain.

Reminiscing on his time at Williams, Webber told the Sydney Morning Herald: "I think it's fairly safe to say I won't be looking back with any fond memories.

"When I signed with the team, I was hoping to stay at Williams for a long, long time, but it wasn't to be.

"Frank (Williams) will probably look back at me and think it wasn't successful either."