Ok
A hit and run often results in and would have resulted in a police contract and a crime ref number, fact
Often, the victim would be asked to describe the hit and run person/s - that would be in her report
In your defence OP, I bet you she described a different bloke wearing different clothing of different weight, height facial features
Importantly, as the OP's ins was dealing with this - they need to be contacted and made aware of this and ensure they understand that your was advised in writing etc "case closed, no further action."
Let the insurance deal with it
OP, because of the line of work re your OH - does anyone else drive the same cars on his behalf??
What evidence did you provide your insurance to make them accept the fact your OH and the car was diffinetly hundreds of miles away from that area??
Has you OH ever been in that area and if so when??
Importantly, your insurance would have had to have evidence to state the car and the driver, ie your OH was not 300 miles away