Triumphant Button's benchmark to be tested

LONDON: After winning three of the first four races of the Formula One season in Asia and the Middle East, Jenson Button heads back to Europe and into the unknown.

The championship-leading Briton has been the quickest and most consistent driver so far but, as McLaren's world champion Lewis Hamilton showed on Bahrain on Sunday, the rest are picking up the pace.

Button's Brawn GP team had an early advantage with a controversial rear diffuser which others first tried in vain to outlaw and are now busy copying.