A 'no win, no fee' solicitor won't help as there is nobody to prosecute.
As has already been said, we have heard your husband's side of events but if traced the driver could say s/he was unaware of any cyclist running in to his/her car and deny stopping.
When a cyclist ran in to me (I was stationary in a queue of traffic at the lights, he came literally flying from the canal and landed in to the side of my car) I had to pay the ambulance costs as is standard and had to bear the costs of repairing my car myself.
If the driver is ever traced and prosecuted for any driving offence your husband could sue him for loss of pay and other losses such as the trousers, maybe compensation for shock and cuts, but that is all.