No, because the driver isn't uninsured or we don't know that he was. The MIB is for uninsured drivers.
You can report it to the police.
If they can identify the culprit then you can claim from him.
Otherwise, I'm afraid, there is nobody to claim from.
If you are fully comprehensively insured then your own company should cover it.
If you can prove it was a bus then you could claim against the bus company.
Can I clarify anything for you?