"Aids or appliances that a
      person uses to support their physical mobility may include walking sticks,
      crutches and prostheses."
    
    [This is what the DWP says about 'aids' in general:]
    
    "The aid must be necessary to help the
      Claimant perform an activity. Everyone uses aids to some extent. For
      example, many people use dosette boxes as they are useful to manage a pill
      regimen, but this does not necessarily mean they are improving or
      repairing a functional impairment by using it. You must consider: 
    
    
      - Affordability
- Availability
- Practicality, based on their
          disability and domestic circumstances.
Decision Makers] should distinguish
      between:
      - an aid or appliance that a claimant
          must use or could reasonably be expected to use in order to help
          overcome the claimant’s functional loss; and
- an aid or appliance that a claimant
          may be using or wish to use because it makes it easier to carry out
          the activity but is not
- reasonably required to overcome a
          functional loss
Descriptor awards for using an aid or
      appliance should only be given in the former case. An aid or appliance is
      not reasonably required in the latter.
      
      Where a claimant chooses not to use an aid or appliance that he or she
      could reasonably be expected to use and would enable them to carry out the
      activity without assistance, they should be assessed as needing an aid or
      appliance rather than a higher level of support."