Doubt whether this would be written off. I would be inclined to get the work done by a Toyota bodyshop however, to ensure the repairs are of a sufficient standard not to affect the Toyota corrosion warranty. The insurer will probably want you to use their approved repairer, but as far as I'm aware, they cannot insist you do. The Toyota bodyshop would probably provide a courtesy car whilst your is being repaired - but check with them. The third party's insurer, if they accept responsibilty, may offer to repair your car. This happened to me when a third party ran into the back of a Mazda I had. I chose the repairer and the third party insurer paid for a hire car for the duration of repairs. The accident still needs to be reported to your own insurer. If the damage is more extensive than it looks and the car is written off, most insurers have a clause where they replace your car with a new one if written off in the first 12 months - check your policy.