Only thing I can share is my last experience with AA insurance.
I was driving home from a nightshift, many years ago, and reached a giveway where I stopped. A car coming over a rise to my right, at speed, lot control and the back end swung out and collided with my stationary car.
I had a colleague in my car who was willing to act as a witness for me as well as a driver who had been behind the speeding vehicle and a pedestrian on the opposite footpath.
I submitted my claim for damage to my car and waited. A little later I was contacted by the AA as the other driver was blaming me. They shared details of the alleged damage to their car in the incident. My passenger had seen the car two weeks after the crash and informed me that there was additional damage to the vehicle that had not been there following the crash. I reported this to the AA and ensured they had details of all the witnesses.
Two weeks later they contacted me again to say they has settled in full with the third party having found me 100% at fault! At no time did they make contact with any witnesses or give me an explanation for their findings.
They have not gotten a penny from me since.
Avoid at all costs.