ZZ (France) v Secretary of State for the Home Department (Case C-300/11); [2013] WLR (D) 218
“Where a national authority had failed to inform an EU citizen precisely and in full of the public security grounds, and the related evidence, upon which it had made a decision under article 27 of Parliament and Council Directive 2004/38/EC refusing the citizen entry, the national court was required, pursuant to articles 30(2) and 31 of the Directive and article 47 of the Charter of Fundamental Rights, to ensure that that failure was limited to that which was strictly necessary. The court had to ensure, in any event, that the citizen was informed of the essence of the grounds in a manner which took due account of the necessary confidentiality of the evidence.”
WLR Daily, 4th June 2013
Source: www.iclr.co.uk