The information requested falls within the responsibility of the UK Statistics Authority. I have asked the Authority to reply.Letter from Karen Dunnell, dated March 2009:"As National Statistician, I have been asked to reply to your Parliamentary Question asking how many (a) non-UK born UK nationals and (b) non-UK born non-UK nationals it is estimated there are in the working population of Britain; and what proportion of that working population each category represents. [262051]""The requested information is shown in the attached table.""The estimates are derived from the Labour Force Survey. As with any sample survey, estimates from the LFS are subject to a margin of uncertainty. This is assessed in a footnote to the table.""The figures in the table are derived from the LFS microdata which are weighted using the official population estimates published in autumn 2007. Consequently they are not entirely consistent with the figures published in the monthly Labour Market Statistics First Release, or the non-UK born employment figures published every quarter, which are weighted using more up-to-date population estimates. However, in this case the difference is very small. The figures in the table add up to 3,820 thousand non-UK born people in employment, compared with a figure of 3,819 thousand published on 11 February." Non-UK born people aged 16 and over in employment by nationality, three month period ending December 2008, United Kingdom, not seasonally adjusted Thousands and per cent Number¹ As a percentage of all people in employment UK nationals *1,466 5 Non-UK nationals *2,354 8 ¹ Coefficients of Variation have been calculated as an indication of the quality of the estimates, as described below: Guide to Quality: The Coefficient of Variation (CV) indicates the quality of an estimate, the smaller the CV value the higher the quality. The true value is likely to lie within +/- twice the CV - for example, for an estimate of 200 with a CV of 5 per cent. we would expect the population total to be within the range 180-220. Key Coefficient Statistical robustness * 0 [le] CV <5 Estimates are considered precise. ** 5 [le] CV <10 Estimates are considered reasonably precise. *** 10 [le] CV < 20 Estimates are considered acceptable. **** CV = 20 Estimates are considered too unreliable for practical purposes. Note: It should be noted that the above estimates exclude people in most types of communal establishment (e.g. hotels, boarding houses, hostels, mobile home sites etc). Source: Labour Force Survey