FORMER top government officials are to be asked to testify to the Legislative Council's Public Accounts Committee on the housing package offered to Hospital Authority staff. They are former chief secretary Sir David Ford, former secretary for civil service Barrie Wiggham, and former secretary for health and welfare Elizabeth Wong Chien Chi-lien, now a legislator. Sir Sze-yuen Chung, the former Hospital Authority chairman, will also be invited to the hearing early next month. All said last night they would attend the hearing. However, a spokesman for Sir Sze-yuen had declared earlier in the day that he would not attend. It was not clear why he had changed his mind. In 1991, Sir Sze-yuen was involved in the cost overrun controversy at the Hong Kong University of Science and Technology, of which he was council chairman. He refused to attend an accounts committee hearing, but backed down after Legco warned it would use the Power and Privileges ordinance to summon him. Sir David, now the Hong Kong Commissioner to London, and Mr Wiggham, the Hong Kong Commissioner to Washington, will attend the meeting during routine visits to the territory. Mrs Wong said it was her duty to attend, adding:'I will certainly answer all the queries raised.' Committee chairman Eric Li Ka-cheung said many questions about the Hospital Authority staff's fringe benefits could only be answered by officials in charge at the time. Their evidence was needed because the Government yesterday refused to provide the July 1990 Executive Council paper on the housing package. Committee member Sin Chung-kai said the committee would ask officials whether the Executive Council had been fully informed about the benefit package before it was approved. The Director of Audit's report this month revealed the authority's 3,150 senior staff would be paid $6.7 billion more in housing benefit than their civil service peers in 20 years' time. Top government officials fumbled their answers in Monday's committee hearing about the role of the Executive Council in the decision making.