Sorry to hear dude. My sister had a familiar story, she parked in my usual parking slot on a side road since i was working away from home, and some asshole drove into her car so badly, her car moved a whole car space back and blocked my neighbour driveway. We knew exactly who it was but the police did fuck all about it. we even had a part of the vehicle grill on the floor, and the car was actually parked 20 meters away. It belonged to a bunch of inbreds..... police called, requested forensic, and they didn't do anything about it, saying it cost too much for something too little. In the end, we had to bite the bullet and put it thru insurance claim... and those c***s got away with it, and moved away 3 weeks later.... As c*ntish as it may sound... if you do hit someone.... just drive off since alot of people will do the same to you... and when it happens..... just gotta repair it and dont place your hopes on the police assisting you. Thats my personal opinions of the police since moving to bristol, i had 3 accidents and 1 which is a hit and run. They did nothing about the situation.
I hope you can sort it out asap and better luck next time