Fear in the City as shares plunge again By Harry Wallop, Consumers Affairs Correspondent Last Updated: 1:34am BST 17/08/2007 Shares on the London stock market plunged yesterday in their biggest one-day fall for more than four years amid fears that the British economy could be badly damaged. Turmoil engulfed the world markets as financial traders, already nursing heavy losses from last week, started to panic again over the American mortgage crisis. London's FTSE 100 index of leading shares ended the day down 4.1 per cent or 250 points at 5,859, the largest loss since March 2003. With £60 billion wiped...