London has a long and well-documented history as the seat of government for the United Kingdom and as one of the major world financial centres. The current spatial structure of the city is very much a function of this history and can be described using three central poles: the City, Westminster, and the port. We report on the current state of occupational segregation across London using data from both the 2001 and the 2011 Census. We supplement this with an exploration of a multilevel modelling framework through which segregation can be modelled and better understood. Using the occupational data from London we develop an approach showing segregation values complete with confidence intervals for significance testing. We also look back into the urban geography literature and suggest further potential for the modelling framework we introduce.