I had friends capable but no spare wheel ,the rac will change the wheel when eventually arrive , but not supply it ,maybe you now understand.
Most spare wheels supplied with cars nowadays tend to be a temporary solution to get you to the nearest tyre repair specialist to have the damaged tyre fixed / replaced.
Having a spare achieves what options for a disabled person?
1: hope you actually have someone with you not only physically capable but confident enough to change it so you can drive yourself to the nearest tyre repair centre
2: Let the RAC come out and change it for the temporary spare then follow you to the tyre centre to make sure you get there ok
3: Let the RAC tow you directly to a tyre replacement centre or your final destination
Having a spare wheel on most modern cars only gives you a very temporary option not a complete replacement until you feel like getting the main one fixed