1. An earlier version of this paper was read at the Society for Applied Philosophy's Workshop on Philosophical and Ethical Issues in Medicine at its meeting in Manchester on 12 November 1983: my thanks to participants for their criticism; and to David Rea for his comments
2. Correction: Risk and medical ethics, Pochin, E. Journal of Medical Ethics 1982, 8: 180-184.
3. UK 1972/76' it should have read;miles travel
4. Percentage risk of fatality to passenger, per 100 miles travel, UK 1972/76'. The author adds that he very much regrets the error