This paper is concerned with the changing information environment in the U.K. National Health Service and its implications for the quantitative analysis of health and health care. The traditionally available data series are contrasted with those sources that are being created or enhanced as a result of the post-1991 market-orientation of the health care system. The likely research implications of the commodification of health data are assessed and illustrated with reference to the specific example of the geography of asthma. The paper warns against a future in which large-scale quantitative health research is only possible in relation to projects which may yield direct financial or market benefits to the data providers.
