Land Transport Act 1998, s 22(2)
If the other driver asks you, you’re legally required to tell them your name and address, your vehicle’s registration number, and, if you don’t own the vehicle, the name and address of the owner.
It’s also a good idea to give them your insurance company’s details.
Note: You shouldn’t say whose fault you think the accident was. It’s possible your insurance company will refuse to pay out if you say that the accident was your fault.