It is the ultimate list of rogue states: the countries whose diplomats repeatedly refuse to pay the congestion charge stumped up by every ordinary motorist in London. And it is no surprise to the mayor, Ken Livingstone, that the serial offender topping the non-payment charts for the last six months is the United States, whose ambassador he memorably likened to a "chiselling little crook" for his refusal to pay the £8-a-day charge. Narrowly ahead of other paragons of international respectability - Nigeria, Angola and Sudan - the US embassy racked up £271,000 in fines over the last six months, according...