You should firstly ensure everybody is ok, if not call for an emergency services.
Examine both your car and the third party’s car. Exchange details with the third party.
Get evidence- take note of location, Take pictures/ videos and contact details of any witnesses
Contact your insurance to notify them that a collision has happened which is non fault and you are going through TP’s insurance to fix your car.
We understand that it can be very stressful dealing with an accident that you did not cause, hence why we provide an additional service to ensure this journey is smooth for you. You can submit details of your claim now.