If you have been a victim of a personal injury incident as a consequence of being on a bus then the first thing to realise is that you will be able to claim compensation for your injuries.
If you are involved in an accident then the party at fault will have to cover the cost of your injuries be they mental, physical, or both.
So, as a plaintiff you will be making a claim against either another road user, whose driving caused the bus driver to crash, or the bus driver, whose negligence caused the bus to crash (so basically the insurance company of the company that employs the bus driver).
This can be somewhat divaricate but it is essentially down to either other road users or the bus company.
if you want to get into the semantics of it then it can be the company that is responsible for servicing of the bus company, should there have been an accident that is the result of a mechanical failure of some kind.
This is usually carried out by the company that owns the bus anyway, so pretty much comes under the remit of the bus company.
If you have been involved in a accident in relation to public services then contact your local no win no fee solicitor.
They are trained in handling these cases.
The whole process involves very little input on your behalf, and before you know it you will be receiving the personal injury compensation that you deserve.