 In 1960, Justice Siddiqui started legal practice at the Sindh High Court.Justice Siddiqui was awarded honorary membership of the Judicial fraternity of Australia and Canada after the news of his resignation from the office of the Chief Justice was made public in January 2000, after his refusal to take the Oath under the PCO (Provisional Constitutional Order), which was an extra-constitutionally prescribed Oath for the Judges by the military regime of Pervez Musharraf.Saeeduzzaman Siddiqui received a letter of commendation from the Judiciary of the United Kingdom and was inducted in the roles of Judges of imminence by the British Judiciary for his stand in the cause of the independence of Pakistan's Judiciary, his stand was later glorified by the lawyers movement in Pakistan which helped Chief Justice Ifthikar Chaudhary's restoration.