Thu 5 Feb 2004 PM's tough line on immigration quickly diluted by Downing Street ALISON HARDIE POLITICAL CORRESPONDENT TONY Blair threatened yesterday to deny eastern European immigrants access to Britain after their countries join the European Union. The Prime Minister adopted a surprisingly tough line under close questioning from Michael Howard, the Conservative leader. However, only hours later, his policy appeared in chaos as Downing Street suggested that immigrants from the Warsaw Pact succession nations would not be denied the right to work, only the right to social security benefits. Only Britain and Ireland have failed to put controls in...