A list of some key resources for comparing London with other world cities.
European Union/Eurostat, Urban Audit
Arcadis, Sustainable cities index
AT Kearney, Global Cities Index
McKinsey, Urban world: Mapping the economic power of cities
Knight Frank, Wealth report
OECD, Better Life Index
UNODC, Statistics on drugs, crime and criminal justice at the international level
Economist, Hot Spots
Economist, Global Liveability Ranking and Report August 2014
Mercer, Quality of Living Reports
PWC, Cities of opportunity
BCG, Decoding Global Talent
Forbes, World's most influential cities
Mastercard, Global Destination Cities Index
Numbeo, Database of user contributed data