National Statistics on children detained solely under Immigration Act powers by country of nationality as at 31 March 2009 are published in Table F of the supplementary tables to the Control of Immigration: Quarterly Statistical Summary, United Kingdom: January - March 2009 bulletin; this is the latest date for which published information is available. Copies of this publication are available from the Library of the House and from the Home Office's Research, Development and Statistics Directorate website at:
http://www.homeoffice.gov.uk/rds/immigration-asylum-stats.html