Just to add to Richard's post, since December 2006, all public sector bodies have to adhere to the Disability Equality Duty (DED), which amongst other things requires bodies such as DWP to have due regard to taking steps to meet disabled people’s needs, even if this requires more favourable treatment when carrying out their functions. So regardless of the legislation in place for IB, they have to consider suitable alternatives under the DED where appropriate and necessary.
For more on the DED, see Do the Duty website
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