A successful criminal prosecution is in your interests.
A conviction is not binding on a civil court deciding liability, but it is strong support for the contention the driver is liable.
With that in mind, do what you can to encourage and assist the criminal prosecution - you probably want to do that anyway, so no hardship.
Many insurance companies will pay for a barrister to represent their client in a motoring prosecution.
Not because they want to help the client avoid a conviction, but because the insurance company knows a not guilty verdict will assist them in their efforts to minimise the pay out to the injured third party - you.
On the subject of sick pay, you say you get six months full pay while on the sick.
It is worth knowing how this is usually calculated.
Your employer will claim statutory sick pay on your behalf and then effectively reduce your wage by that amount, thus you receive 'full pay' in your wage slip.
That's fine, but you may hit the financial buffers if the recovery takes longer than six months.
Your employer will stop paying you, as per the contract, and you cannot claim any more statutory sick pay because there's a six month limit on that and you will already have had it.