Today a driver drove straight into the back of my car. I was stationary, in a queue waiting for the lights to change. He has damaged the bumper but also the frame of the boot, and the left side lights. The boot can't be closed any more. My partner was in the passenger seat, and his head was thrown forward and back. I suffered less as I could see the crash coming in my rear view mirror. Anyway, this is my first experience of an accident and I don't really know what to do. The driver wants to settle in cash with us, but seems to think that the damage was minor. I don't know if he is right. If I don't report the accident within 48 hours then is it right that I forgo the possibiilty of insurance settlement if he doesn't agree to pay up?