BLAIR LEADS LABOR TO SECOND SWEEP OVER THE TORIES
Prime Min Tony Blair and Labor Party sweep to victory in Britain's election, sending Conservatives to their second consecutive large-scale defeat and guaranteeing Labor its first re-election to a full term in office; William Hague, Conservative leader, concedes defeat; Labor is winning with majority similar to landslide 179-seat margin it received when it came to power in May 1997; photos (L)
