Re: It will be interesting when the 1st similar case happens in the UK what the police reaction is
"If the front of your vehicle contacts the rear of the other vehicle, your'e at fault - almost even in cases where they reversed into you (I say 'almost' - I think innocent people have been charged over this)."
That's the default presumption. If you have a witness/dashcam that shows otherwise, you are covered. With the cost of dash cams dropping through the floor, it's a good idea to fit one on your car. Just watch what you say as they record audio which might not be a great thing for you in some cases.