Government statisticians have upwardly revised by nearly half a million population estimates across 348 local authority areas in England and Wales - in light of the 2011 Census. Figures released by the Office for National Statistics (ONS) show the Census unearthed 464,000 more people than were forecast. This represents a population increase 0.8% higher than that previously calculated on a ‘rolled forward' basis – which involves taking the previous year's estimate and factoring in births and deaths and migration patterns.