I wonder if the issue might be that OHM’s agreement with Motability only allows them to fix charges where the Motability client has exclusive use of the space. Motability wouldn’t want to fit a charger only to then have the client contacting them to say that they can’t use the charger because other people are always parking in the space. Perhaps ask your landlord for a letter saying that the spaces are for exclusive use of tenants. They wouldn’t be saying that any particular space is exclusively for you but it might be enough for OHM. Depending on your site chances are that with an 8m cable there may be 2 or 3 different spaces you could park in and be able to use the charger anyway.