Siobhain acted for an international banker arrested and investigated by the NCA upon suspicion of involvement within a conspiracy to supply drugs. The background to the allegation involved an organised crime group, and the other defendants were arrested in possession of guns and ammunition as well.

Upon advising her client to give co-operate in full, give a detailed explanation within a lengthy interview, which were followed by robust written submissions, the NCA eventually dropped the investigation and potential prosecution, reluctantly and after several months.