If you really want to see which types of accidental cars are being imported, repaired locally and sold as genuine, try visiting Car Point on Multan Road. He is one of the biggest importers of cars in LHR and he has setup his very own workshop to repair these cars. He is only importing clean cars on customer's requests. He is supplying repaired cars to many dealers on Jail Road.
I have seen cars with crumpled roofs being replaced, entire front of the cars being replaced by half-cuts, etc.