The BBC are reporting that the proposed cuts to Disability Living Allowance could break the Human Rights Act. It's worth a try legally, though I doubt it'll work.
There's a quote from Maria Miller MP (Conservative, Basingstoke), the Minister for Disabled People at the end of the piece.
We are dealing here with a benefit which as I said is one of the largest benefits that's paid in the UK and that we need to make sure it's getting to the people who need it most.
"Need it most"? "Need it" would be a much better attitude to take to these benefits (and indeed benefits in general). Someone's need for additional cash to support themselves is not diminished just because some else has an even greater need.
Of course, given that there is a consensus between all major political parties that DLA is too easy to get - despite it already being refused to people with severe disabilities - there's not much hope here.
Much more information about the proposals and their flaws is at Where's the benefit.