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Although it is difficult to measure how many people reside in the UK without authorisation, a Home Office study based on Census 2001 data released in March 2005 estimated a population of between 310,000 and 570,000.〔(The thorny issue of illegal migrants ) BBC News, 17 May 2006 The methods used are also much debatedhttp://migrationobservatory.ox.ac.uk/briefings/irregular-migration-uk-definitions-pathways-and-scale. Problems arise in particular from the very nature of the target population that is hidden and mostly wants to remain as suchttp://onlinelibrary.wiley.com/doi/10.1111/j.1469-8676.2011.00191.x/references;jsessionid=D55A99859E2D8DB93182491C55168A04.d01t02?globalMessage=0. The different definitions of ‘illegality’ adopted in the studies also pose a significant challenge to the comparability of the data.〕 More recently, a study carried out by a research team at (LSE ) for the Greater London Authority, published in 2009, estimated the undocumented migrant population of the UK by updating the Home Office study. The LSE's study takes into account other factors not included in the previous estimate, namely the continued arrival of asylum seekers, the clearance of the asylum applications backlog, further undocumented migrants entering and leaving the country, more migrants overstaying, and the regularisation of EU accession citizens. The most significant change in this estimate is however the inclusion of children born in the UK to undocumented migrants. For the LSE team undocumented migrants oscillate between 417,000 and 863,000, including a population of UK-born children ranging between 44,000 and 144,000. Drawing on this and taking stock of the outcome of the recent (Case Resolution Programme ), a University of Oxford's (study ) by Nando Sigona and Vanessa Hughes estimate at end 2011 a population of undocumented migrant children of 120,000, with over half born in the UK to parents residing without legal (immigration status ). == Definitions == Illegal (sometimes termed ''irregular'') immigrants in the UK include those who have: * entered the UK without authority * entered with false documents * overstayed their visas * worked or studied on a tourist visa/ non-immigrant visa waiver * entered into forced or fraudulent marriage〔(【引用サイトリンク】title=Woman with IQ of 49 ‘was targeted for sham marriage’ )〕〔(【引用サイトリンク】title=Sham marriage gang jailed )〕〔(【引用サイトリンク】title=Couple jailed over South London sham marriage )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Illegal immigration to the United Kingdom」の詳細全文を読む スポンサード リンク
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