Financial proxies used to determine DLA rates

Does anyone have information about the financial proxies that were used when DLA rates were set? I know they were designed to help people cover the increased costs assumed with particular levels of disability, but I haven’t been able to get specific information on how they were calculated.  It would be helpful to look at, especially in relation to proposed change to PIPs.
Julie Kemmy

Never been able to find anything concrete, although there might be documents in the House of Commons library from before 1992 in the run up to the DLA reforms (sometimes MPs Westminster researchers will have a look).

There are one or two DWP papers, but again not reaching any conclusions, such as:

http://research.dwp.gov.uk/asd/asd5/rports2007-2008/rrep542.pdf

and

http://campaigns.dwp.gov.uk/asd/asd5/summ2009-2010/542summ.pdf

Some would say that the DWP should done some thorough reaerch on this topic before planning all the changes(!)

Thank you so much - very interesting documents.