The information requested falls within the responsibility of the UK Statistics Authority. I have asked the authority to reply.Letter from Karen Dunnell, dated May 2008:"As National Statistician, I have been asked to reply to your question asking what the projected a) population and b) population density of (i) the UK, (ii) England, (iii) Scotland, (iv) Wales and (v) Northern Ireland is for the most distant projection made by the Office for National Statistics; and what assumptions about migration have been used in calculating such projections (207695).""The 2006-based national population projections published results for 75 years ahead, that is, to 2081. Details of how to calculate the population densities for any year of the projections were provided in my reply to your PQ dated 19 May 2008 (205787). Using the country areas provided in this answer, and the projected population totals for 2081, produces the following projected densities:" Projected population density of UK and constituent countries in 2081 Projected population (Million) Area (sq km) Density (persons/sq km) United Kingdom 85 242,495 352 England 75 130,279 574 Wales 3 20,733 168 Scotland 5 77,907 64 Northern Ireland 2 13,576 152 Source: 2006-based national projections, ONS. "The long-term assumptions of annual net migration to the United Kingdom and constituent countries used in these recent national population projections are as follows:" Country Long-term migration assumption England +171,500 Wales +9,500 Scotland +8,500 Northern Ireland 500 United Kingdom +190,000 "As previously advised in my reply to your earlier PQ (177459), the underlying assumptions for the projections are demographic trend based and should not be seen as predictions."