The Office for National Statistics (ONS) released an article on Energy Efficiency of Housing in England and Wales (ONS) on 10 November analysing Energy Performance Certificate data.
Cyhoeddodd y Swyddfa Ystadegau Gwladol (SYG) erthygl ar Effeithlonrwydd Ynni Tai yng Nghymru a Lloegr (ONS) ar 10 Tachwedd, gan ddadansoddi data ar Dystysgrifau Perfformiad Ynni.