UK population to rise to 65m by 2016 / National Statistics, 23 October 2007
http://www.statistics.gov.uk/cci/nugget.asp?id=1352
"If past trends continue, the population will continue to grow, reaching 71 million by 2031. This is due to natural increase (more births than deaths) and because it is assumed there will be more immigrants than emigrants (a net inward flow of migrants)."
National Statistics News release
PDF - http://www.statistics.gov.uk/pdfdir/pproj1007.pdf