Drawing on empirical investigations based on national labour force surveys (Enquête Emploi for France, LFS and GHS for The UK) for years 1982-3 and 2001, the aim of this paper is to expose relationships between new external and internal conditions faced by organisations and permanencies and transformations of the macro structure of these two labour markets. We used multiple correspondence analysis (MCA) and hierarchical classification algorithm to constitute the typology of segments structuring labour market. The evidence suggests that the dualistic opposition between a primary and a secondary sector on labour market is still relevant. But in the same time, we go from three segments architecture to a fourfold division on labour market, both in France and the UK, with the apparition of a “Labour Insecurity” class.