Ok heres the deal repairable write of over 15 yo can be repaired and put back on the road you will need proof of sale and a rwc to get it registed .A repairable write under 15 yo must under go a viv check .You have to show reciets for proof parts you have brought to show there not stolen ,they may even take the vechile for testing .once they have give you the viv certificate then you can get a roadworthy and register it ....As for your car they will never know its been in a smash unless you tell them. even if you do say something to them they cant say #### to you as once its repaired all you gotta do is get a rwc and pay the rego ..hope this helps