Five years ago today the biggest cash robbery this country has ever seen was carried out in Kent. A gang forced their way into the Securitas building in Tonbridge escaping with an astonishing fifty three million pounds. Although almost all of them are behind bars much of the cash has never been found. Tonight we hear from the manager the robbers handcuffed and threatened at gunpoint. And look at ongoing efforts to trace the missing millions. Here's our Correspondent Derek Johnson.