EMBARGOED TO 0001 SATURDAY DECEMBER 28 File photo dated 05/10/74 of damage following an IRA bomb attack on the Horse and Groom pub in Guildford. In 1989 Ireland's foreign minister Gerard Collins privately told the British Home Secretary Douglas Hurd that the controversy surrounding the Birmingham Six and Guildford Four cases was "seriously affecting" the relationship between the two nations, newly released state papers have revealed.