It depends.
If they hit you with their door, it's usually their fault. If you hit their door with your car, it's most likely your fault.
That said, the burden of ensuring the way is clear is ALWAYS on the reversing vehicle.
the person pulling out
The car pulling from the parking space is at fault
I would have to say that technically it would be the driver pulling out of the parking space. TECHNICALLY speaking that is. The insurance companies would probably try to say it is an equal at fault accident maybe.
I beleive, whoever's car is moving (wheel-wise), is at fault.
It is your fault.
Unless thare are other than normal circumstances, the driver of the parked vehicle would be at fault as it is his duty to ensure that it is safe to join the carriageway...
If you are pulling out and hit the other car.....you are. Person in the lane has the right of way.
it is the person coming out of the parking space
My fault
Backing up--it is your fault.
Yours.
It can be called a 50/50 accident... ususally the adjuster can determine that.