The recent discussion of the State Earnings Related Pension Scheme in Britain in terms of the unfavourable demographic position early next century has highlighted how little attention is normally paid by British politicians and social policy analysts to population size and structure. Further, the attention is normally confined to the question of how policy should adapt to demographic change, rather than how to modify it, although Britain has an implicit policy of restricting family size. Britain is not alone in this but many countries show more concern about the future of their population and some wish to increase it. Among these is France. This article compares Britain and France: first, over the priority given to demographic issues by statesmen and academics; and second, over the advantages and problems seen in different demographic futures. It argues that family policy needs to be seen in a demographic context.