THE families of those who suffered brain damage in the Hongkong Bank arson attack have sought help from a Hong Kong University neurologist. Three men and four women were still unconscious yesterday at Kwong Wah Hospital and Caritas Medical Centre, four days after the attack on Monday which killed five of their colleagues. Lee Chun-keung, son of 56-year-old bank manager Lee Chi-wan, who is under intensive care at the Caritas, said: ''My father and the other patients are in a coma and have made no improvement. We cannot just sit here and rely on luck. ''If there is a chance to save their lives, we must grab it.'' Many of the surviving victims suffered brain damage from smoke inhalation. The families have asked the Caritas Medical Centre to allow Dr Yu Yuk-ling, a Reader of Hong Kong University's Department of Medicine, to visit the patients, and the hospital agreed. ''It's not that we do not have confidence in doctors from Caritas - they have done everything they can. But we would like to consult other doctors outside the hospital and seek more opinion,'' Mr Lee said. ''They all suffer from brain damage and their brains were deprived of oxygen. So we want to consult with other experts. We are told Dr Yu is one of the experts on neurology. So we seek help from him.'' Dr Yu was not available for comment yesterday. Mr Lee said the families might seek help from overseas if necessary. He said families of patients at Kwong Wah also wanted other doctors to see the patients and the Hongkong Bank would help with arrangements. Bank spokesman Bob Sherbin said the bank officials had had discussions with the Hospital Authority but declined to give details. ''We are trying to help the families in what they are looking for during this very difficult situation. If the families wish for other doctors, we will be pleased to help them,'' he said. The bank has hired a London-based international firm specialising in the investigation and prevention of fires. Gerald Southerd, a partner with Dr J. H. Burgoyne and Partners, consulting scientists and engineers, will spend nine days in the territory investigating the cause of the Shekkipmei blaze and ways of making banks safer. Mr Southerd, a chemical engineer who spent 13 years with the Metropolitan Police Forensic Science Laboratory, will arrive early next week. He hopes to be able to interview Mui Yin-yee, 32, the staff member who is recovering fastest from the attack, if she is healthy enough. Mr Southerd will also discuss the arson attack with members of the Fire Services Department. Yesterday, the 12-strong committee of the Hong Kong Association of Banks (HKAB) agreed to work with the government inter-departmental committee set up to establish whether fire safety legislation needed updating following the blaze. The taskforce, headed by the Fire Services Department, has until February 28 to report. The HKAB, which represents 172 banks, says it will provide a voice for the concerns of staff.