Leader Button will not let up

FORMULA ONE: World championship leader Jenson Button says he won&rsquo;t take his foot off the gas in the pursuit of a first world title.<br /><br />The Brawn GP driver leads the standings by 26 points from team-mate Rubens Barrichello after winning six of the opening seven races.<br /> <br />But the Brit warned: &ldquo;You can&rsquo;t take anything for granted. You&rsquo;ve got to keep pushing. So although I&rsquo;ve a 26-point lead, which is just out of this world, I'm still not going to lift off.&rdquo;<br />