LONDON: Jenson Button believes his attempt to become the first British driver to retain the Formula One drivers' world title will be one of the most difficult in the history of the sport.

Button, 29, won his first title after finishing fifth in Sunday's Brazilian Grand Prix to succeed 2008 world champion and compatriot Lewis Hamilton.

However, Button has not won a race since June. His Brawn GP team only came into existence at the start of the season, rising from the ashes of Japanese manufacturer Honda's withdrawal from the sport.