A list of some key resources for comparing London with other world cities.European Union/Eurostat, Urban AuditArcadis, Sustainable cities indexAT Kearney, Global Cities IndexMcKinsey, Urban world: Mapping the economic power of citiesKnight Frank, Wealth reportOECD, Better Life IndexUNODC, Statistics on drugs, crime and criminal justice at the international levelEconomist, Hot SpotsEconomist, Global Liveability Ranking and Report August 2014Mercer, Quality of Living ReportsPWC, Cities of opportunityBCG, Decoding Global TalentForbes, World's most influential citiesMastercard, Global Destination Cities IndexNumbeo, Database of user contributed data