The Director of Public Prosecutions Keir Starmer QC has refused to consent to the private prosecution of terror suspects Babar Ahmad and Syed Ahsan.
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The robbers casually approached their victim on a busy high street before before spraying a noxious substance in his face.
Tencho Hristov ignored warnings and got trapped between barriers at Roydon in Essex.
The 6km bike track will include 130m of the South Circular near Kew Bridge.