And they say:
Can I use my Motability Scheme car for business?
The car is covered for social, domestic and pleasure purposes including travel directly between home and permanent place of work, at all times under the Certificate of Motor Insurance. If you require to use the car for any other purpose, please contact RSA Motability (RSAM) to request cover for business use.
So it doesn’t seem to be automatically rule out.
Work up a good case and ask?