If your missus is injured then as its a Fail to stop injury accident the Police have the power to arrest the bas%$ !!!

If they don't take it seriously then complain, but first let them know of the injuries.
Make the complaint to their Inspector and if you're not satisfied with the response, then tell them your going to make a complaint to their Proffesional Standards unit.
It's likely that this should do the job.

Hope she's alright and has no more than whiplash. That is an injury. Don't be fobbed off