The driver who hit me wasn't prosecuted despite me spending time in hospital, having an operation, and her admitting responsibility. The arguement being that it wasn't in the public interest. Ultimately this meant that the taxpayer would spend lots of money and tie up resources to prove what the driver had already stated - that she properly cocked things up. I understand that the circumstances are different to your case, but ultimately the outcome would be the same - someone might get a slightly slapped wrist and lawyers make a lot of money.