Season revs up

The most obvious difference from 2010 will see the return of Pirelli as the sole tire supplier, 20 years after its last race at a rain-swept Australian Grand Prix in 1991

More pit stops, more risky and complex strategies and, almost certainly, more overtaking - they are the likely key outcomes of the Formula One rule and technical changes for 2011.

The most obvious difference from 2010 will see the return of Pirelli as the sole tire supplier 20 years after its last race at a rain-swept Australian Grand Prix in Adelaide in 1991.