Bray was appointed a Hong Kong cadet in 1950. He was posted as Assistant Secretary for Chinese Affairs due to his fluency in Cantonese. He first made his presence following the Shek Kip Mei Fire on the Christmas Day in 1953, in which he gate-crashed a meeting convened by GovernorSir Alexander Grantham at 6am on the next day, to ask the Governor to resettle the 50,000 homeless people left by the fire. He was subsequently Assistant Secretary of the Colonial Secretariat in 1953. In 1954 he was appointed District Officer of Tai Po until 1956. He was Assistant Director of Urban Services and was the Secretary of the Special Duties Unit dealing with the Hong Kong 1967 Leftist riots. Bray became District Commissioner in the New Territories in 1971. In 1973 he became Secretary for Home Affairs in which he held the office from 1973 to 1977 and again from 1980 to 1984. Between the post, he was assigned Hong Kong Commissioner in London from 1977 to 1980. During his tenure as Secretary for Home Affairs, he occasionally acted as Governor. He oversaw the establishment of the District Boards, which was set up under Governor Sir Murray MacLehose's District Administration Scheme. For his public services he was made Commander of the Royal Victorian Order in 1975 and Commander of the Order of the British Empire in 1977.
Retirement
After his retirement from the government, he remained active in the public life in Hong Kong. He became chairman of the English Schools Foundation from 1985 to 1991, during the Maurice Millard incident in 1991, and chairman of the Jubilee Sports Centre. He was also the director of the Hong Kong Philharmonic from 1985 and executive director of the Community Chest of Hong Kong from 1985 to 1992. He was the president of the Hong Kong Yachting Association between 1989 and 1991. Besides that, he also held several business positions including the directorship of First Pacific Davies Ltd., Herald Holdings Ltds, and Leighton Asia Ltd.
Personal life
He married Majorie Elizabeth Bottomley, who was also born in Hong Kong, in 1952, by whom he had one son Rupert and four daughters, Jennifer, Alison, Diana and Lucy. He wrote an autobiography, Hong Kong Metamorphosis which was published in 2001. He died of blood cancer in Oxfordshire, England on 8 July 2005.