The information requested falls within the responsibility of the UK Statistics Authority. I have asked the authority to reply.
Letter from Stephen Penneck, dated March 2010:
As Director General for the Office for National Statistics, I have been asked to reply to your Parliamentary Question asking how many economically inactive people of working age who were long-term sick or disabled wanted employment in (a) each of the last 10 years and (b) each of the last eight quarters. (321641)
Estimates of economic inactivity are available from the Labour Force Survey (LFS). In accordance with the International Labour Organization (ILO) definition, people are classed as economically inactive if they are neither in employment nor unemployed. The estimates provided comprise those who have not been looking for work in the last four weeks, but who say they would like a regular paid job, plus those who have been looking for work but who were unable to start within two weeks.
These estimates are published in the Labour Market Statistical Bulletin Historical Supplement which is available on the National Statistics website via the following link:
http://www.statistics.gov.uk/downloads/theme_labour/LMS_FR_HS/WebTable13.xls
As with any sample survey, estimates from the LFS are subject to a margin of uncertainty. Indications of the sampling variability of LFS aggregate estimates are provided in the Statistical Bulletin.
Total (thousand) October to December quarter: 2000 744 2001 753 2002 752 2003 670 2004 634 2005 615 2006 611 2007 618 Latest eight quarters: 2008 January to March 664 April to June 658 July to September 653 October to December 628 2009 January to March 599 April to June 618 July to September 659 October to December 676 1 Men aged 16 to 64 and women aged 16 to 59. 2 Those who had not been looking for work in the four weeks prior to interview but who said they would like a regular paid job, plus those who had been looking for work but had been unable to start within two weeks. Source: ONS Labour Force Survey