Development of town & country planning thinking and professional education in Britain has undergone an eighty-year history. Literatures on British planning thinking and education are dominated by a vast number of descriptive documents. The paper argues that transformation of planning thinking and education has been closely allied with the restructuring of capitalist development mode in Britain. This paper thus develops a conceptualization of the urban planning thinking and professional education. It is used to explore how key mechanisms, including planning academic thinking, the employment market, and development of planning professions, have transformed the modernist period to a postmodernist one in Britain's capitalist development. Features and contents of modernist and postmodernist planning thinking and professional education are also examined during the analysis.