Estimates for the wealth Gini coefficient from 1979-2003 are published in Table 13.5 on the HMRC website at
http://www.hmrc.gov.uk/stats/personal_wealth/table13 5_pdf.
Figures for subsequent years are not yet available.
I refer the hon. Member to the DWP publication "Households Below Average Income" and the ONS publication "The Effects of Taxes and Benefits on Household Income, 2004-05".