In 1971, Jones was transferred to the
Hong Kong government and became Deputy Economic Secretary under the Economic Services Branch of the
Colonial Secretariat. In 1973, the Hong Kong Government, under
Governor Sir Murray MacLehose (later Lord), reformed its organisation according to the recommendations made in the
McKinsey Report. A new form of structure, nicknamed "Mini-Cabinet" by the local newspapers, was introduced that six new government posts were rearranged. They were namely the
Secretary for Home Affairs,
Secretary for Housing,
Secretary for the Environment,
Secretary for Social Services,
Secretary for Security and
Secretary for Economic Services. Jones was appointed for the post of Secretary for Economic Services in November 1973, and became the Secretary for the Environment in September 1976. In September 1981, he was appointed as the newly created
Secretary for Transport. However, he had served for only a few months before he was posted to
Brussels and served as Minister for Hong Kong Relations with European Community and Member States in early 1982. He was replaced by
Peter Tsao in May 1986 and retired from the government. When he was Secretary of the Government, Jones was responsible to a number of issues including the construction of
Tsuen Wan line of the
MTR. Besides, he was also an Official
Legislative Councillor from 1973 to 1982 and was member of various organisations and public bodies, such as the director of
Kowloon Motor Bus,
China Motor Bus and Hong Kong Industrial Estates Corporation, the chairman of the
Advisory Committee on Environmental Protection,
Transport Advisory Committee and
Special Committee on Land Production and a member of the Oil Policy Committee. Jones was made
Companion of the Order of St Michael and St George in the
New Year Honours of 1979 for his public services. ==Later years==