Campaigners fighting to overturn murder convictions of family members

Three women discuss how they become campaigners and legal experts in their efforts to overturn murder convictions of loved ones. Brigitte Butcher, of Suffolk, is battling to get hold of forensic evidence that she claims will clear her brother Kevin Nunn of murder. Janet Cunliffe, of Warrington, claims her son Jordan was wrongly convicted of murder under the controversial joint enterprise rule. And Wendy Cohen, from Hoxton, east London, speaks about her seven-year campaign to clear her son Sam Hallam of murder