"Britons have started to vote in what is shaping up as the country's tightest general election for decades. The opposition Conservatives are leading the opinion polls but may not win enough seats to form an overall majority. Estimates have the number of people who will cast a ballot at about 70 per cent, much higher than the 50 per cent or so who showed up at the 2005 election. It has been a disastrous campaign for Labour which saw prime minister Gordon Brown caught calling a voter a bigot and one of his own candidates labelling him the worst prime minister in British history. Last-minute polling gives the Conservatives a seven or eight-point lead. "