Hit by stolen car, found at fault, please help

Hi everyone,

I was in a car accident with a stolen BMW which I have been found to be at fault by my insurance company. I would like advice on how to overturn the decision. I have tried my best to present the information of the incident as succinctly and clearly as possible.

- I came out from a minor road into a major road (indicating right, alone in my car), because the BMW (on my right, nearest lane) was far away enough for me to do so.
- I came out halfway and stopped and observed my left and waited for it clear so that I could go
- Just as the last car on my left passed, I was hit by the BMW, while I was still stationary
- the five occupants of the BMW came out of their vehicle and discarded onto the ground a large quantity of used nitrous oxide cannisters (also known as Cream Chargers, Hippy Crack, and Laughing Gas). The BMW interior was also littered with these used cannisters. These are used to get high (illegally)
- I was physically attacked by the driver of the BMW (once we were both out of our vehicles after the collision), the attack was stopped by passing members of the public
- I called the police, but they refused to attend as it was a car accident with no serious injuries and needed to be dealt with between the two parties involved, this was despite me telling them about the used cannister and attack (I did not know the car was stolen at this point)
- The five occupants of the BMW fled the scene, abandoning their vehicle
- I called the police a second time, and insisted they attend, as one or two of the BMW occupants kept returning and I did not feel safe (one of them returned to recover something from the boot of their vehicle before fleeing again)
- The police arrived around 30 minutes after the collision and took statements, there was one witness but I am not confident how reliable he is as he was a homeless man, I told the police about the used nitrous oxide cannisters and physical attack (the cannisters were there for the police to see anyway)

So my insurance company is finding me at fault on the basis that I came out from a minor road into a major road and the BMW had right of way. This is despite me being stationary when I was hit (my insurance company says I cannot prove this), the BMW being stolen with joyriders inside, and the used nitrous oxide cannisters (an illegal high) inside the BMW. A couple of things to note: 1.) my maneuver was not illegal and it is routinely done everyday on the roads and it was absolutely safe for me to begin the maneuver as the BMW was so far away on my right
2.) the BMW does have insurance, but clearly the owner wasn't at the wheel on the night of the collision as it was reported stolen. It did not have MOT however (I learned this later after an online check). I cannot see my version of events being disputed by the other side as clearly they are in hiding from the police and are untraceable. The only people disputing my version of events is my insurance company.

I have tried my best to present all the relevant information, but I may have missed something.

Please help with any advice, I will be very grateful. I only have Third Party Fire and Theft cover, and will not get anything from my insurance company unless I can overturn the decision for fault.

This seems really unfair that I get hit by joyriders getting high in a stolen car, and yet I am found to be at fault and receive nothing. The BMW driver most likely didn't even have a driving license. I struggle for money and suffer from depression, and my car meant a lot to me. It was one of the only things I had that bought me joy (it's been written off).

The other party has not made a claim against my insurers.

Thank you.