The Department is not able to provide figures on central heating dating back to 1996-97. For local authorities, statistics on central heating and insulation works were first collected from 2001, initially through the Housing Investment Programme (HIP) and subsequently through the Business Plan Statistical Appendix (BPSA) from 2002. The following table displays the number of dwellings (and associated expenditure) receiving works each year, as reported by local authorities.
2000-01 2001-02 2002-03 2003-04 2004-05 2005-06 2006-07 Central heating Number of dwellings 107,188 127,580 125,682 133,732 140,066 139,494 135,477 Expenditure (£ million) 221 261 279 326 380 426 426 Insulation Number of dwellings 111,943 105,572 119,257 138,116 111,633 89,817 81,563 Expenditure (£ million) 62 58 54 59 44 35 33 Note: Improvement work includes works of a capital nature: installation, replacement or major repair. Sources: 1. Figures for 2002-07 from the Business Plan Statistical Appendix (BPSA). 2000 figures from the BPSA's predecessor—the Housing Investment Programme. 2. Figures include those authorities which have chosen to retain their housing stock and also Arms Length Management Organisations (ALMCs).