Not your fault at all, he went into the back so 100% his fault.
I recently had an non-fault accident. Other driver pulled into the side of my vehicle and wrote it off.
Put my premium up by £70 pound with my new insurer :/
I have to declare the accident when searching for insurance and state it wasnt my fault and that its considered "settled" by my own insurance company as I claimed through other drivers insurance.
So every accident will be taken into account, regardless of fault which will put the premium up :/ (Nothing I can do about someone driving into the side of me but oh well)