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2. Energy Bills Will Rise, Warns Ofgem Chief: over reliance on gas, inflation and power station closures to blame;Thomas,2013
3. Mid-1971 to Mid-2011 population estimates: England, Wales and regions; estimated resident population;ONS,2013
4. Census of population 2011 preliminary results;CSO,2011
5. Sub–national total energy consumption statistics for 2008;DECC,2010