KERS should be compulsory in 2011 - Williams

KERS should only return to the F1 grid next year if every car is fitted with the energy-recovery technology.

That is the claim of Sir Frank Williams, whose Grove based team is reportedly keen to see KERS make a comeback in 2011.

Williams has its own hybrid technology company, whose unique flywheel KERS unit was fitted to the Porsche 911 GT3 R at the recent Nurburgring 24 hour race.

FIA president Jean Todt is pushing hard for the F1 teams alliance FOTA to overturn its gentleman's ban on KERS.

KERS therefore already features in the technical regulations, but - if the FOTA ban is dropped - its use is voluntary.