FORMER senior civil servant John Chan Cho-chak has said his position as Kowloon Motor Bus managing director will require integrity when making decisions based on privileged government information from his past. The former secretary for education and manpower, who assumed his KMB post yesterday, resigned from the civil service after 27 years in June. His first day as KMB managing director was spent fielding press questions which revolved around his political ties and access to government information. ''The risk is always there and the best way to deal with it is to use one's personal integrity,'' Mr Chan said. ''There are very strict rules which the Government applies. Any civil servant has to make an application to a committee [which] is concerned with ensuring that the proposed new activity has no conflict of interest with the applicant's background. ''There are various safeguards but in the final analysis what you cannot control is what I keep in my own mind. You can require me to surrender documents but you cannot require me to surrender what I have here,'' he said, pointing to his head. Mr Chan, 50, said he viewed his new position as an extension of his public service, which included Royal Hong Kong Jockey Club stewardship, and membership of the councils of the University of Hong Kong and the Stock Exchange. ''I do not think my making the choice I did was severing my links with the Government, or the Government was severing its links with me. There are various points in one's life and career and it was a natural bus stop,'' he said. ''I always had a very favourable impression of KMB and to a large extent it is a public service company and I regard this as very congenial to my own background.'' He replaces Lawrence Louey, who died last December. Mr Chan did not rule out working in an advisory capacity to China. ''I will be giving my service and best advice to the respective organisations and through that I hope I will be serving the people of Hong Kong,'' he said. ''I think we are certainly in a period by which serving the people of Hong Kong is very much equated with serving the future of the Special Administrative Region. ''I am in touch with various people, including China advisers, and I would be quite prepared to offer my advice if it was sought.'' Mr Chan also revealed that KMB wanted to expand its service into China. He said they had begun discussions with Chinese bus companies and various mainland authorities. KMB's public relations manager, Winnie Ng, said they would like to have more cross-border services. ''We do not want to run just one or two routes. What we want to have is our own plant to assemble buses and to carry out bus maintenance services,'' Ms Ng said. Mr Chan said it was too early to speculate on changes to KMB but added they were waiting on approval of two applications to the Hong Kong Government to expand the franchise to 2001. He suggested the Hong Kong Government consider building more roads, controlling the number of vehicles, encouraging public transport, and assigning bus priority schemes.