What non-fault actually means here
A non-fault accident is one where another party was responsible. Being hit from behind while stationary is the clearest example, but it also covers being hit while parked, being pulled into at a junction and a range of other situations where liability rests elsewhere.
It is not the same as you being certain it was not your fault. Liability is ultimately determined between the insurers on the evidence, which is why photographs, witness details and a prompt report matter so much.
