Ok,
If you are insured by a company for Third part property damage only - and you have a not at fault accident...
if the person at fault as full comp - you go through THEIR insurer
If they have third party property also - you need to work it out. some insurers may offer assistance, but general case is no. this makes it difficult to the not at fault person such as our mate here. it will be hard to make the at fault person lodge a claim. Id contact the police and notify them of the accident (if hasnt been done) and get event number.
then you do what is being discussed - letter of demand.
If they have no insurance at all - Im fairly sure this is a standard cover provision in the general insurance contracts act - however if it isnt, it means some companies will have it, some wont, some at different levels of cover/indemnity.
If you were at fault, you pay your XS and YOUR insurer pays for the damage caused by you to the third party BUT not your car.
read the PDS
call the insurer.
Why would an insurer waste their time for a TP property policy when they get nothing out of it? look at it from that side of the coin!
HTH