EMBARGOED TO 0001 SATURDAY DECEMBER 28 Undated handout file photos of the Birmingham Six (top, left to right) Patrick Hill, Hugh Callaghan and John Walker, (bottom, left to right) Richard McIlkenny, Gerard Hunter and William Power. Documents made public under the 30-year rule show that then taoiseach Charles Haughey told Margaret Thatcher that the arguments for re-opening the Birmingham Six case were "unanswerable".