Population Projections - Comparing Sources and Geographies. This tool contains data from three different sources (ONS, Oxford Economics, and those used within the Cambridge Econometrics growth projections for the RSS), allowing you to easily compare different geographies and sources (NOTE: Macros are included).
Population Change vs. Economic Growth Resource - This analyses illustrates the relationship between population change and economic growth, intended as a starting point for discussion on what questions the evidence raises.
For more information on this, and an online discussion see Population Projections.