Formula One's latest controversy turned serious yesterday when all but one of the top seven cars in practice for tomorrow's Australian Grand Prix ran with bodywork considered illegal by most teams.
Only Mark Webber drove with conventional rear underbody sections on his Red Bull. The Australian was fourth quickest but quickly declared he would be nowhere near that fast in qualifying.
Williams, Toyota and Brawn GP are the three teams using the contentious rear diffuser, said to give them an advantage in terms of grip and airflow.
Williams driver Nico Rosberg dominated both 90-minute practice sessions, leading the timesheets throughout.
The Brawn of Rubens Barichello was second ahead of the Toyota of Jarno Trulli with Webber fourth in the day's second session.
Jenson Button's Brawn finished fifth while the Toyota of Timo Glock was sixth and Kazuki Nakajima's Williams seventh.
Red Bull boss Christian Horner led a protest to the FIA against the use of the radical diffuser but early yesterday, race stewards ruled it legal, allowing the cars to race.
For more, pick up a copy of today's Canberra Times