Category D - Repairable salvage. Minimal damage, probably not structural, but insurer does not want to repair, even though it might be economic to do so. Often stolen and recovered after claim has been paid. Or for unusual models or grey imports where the difficulty of obtaining new parts hinders a quick repair. Does not need VIC inspection to return to road.
my car is actually a cat C
Cat C is repairable but needs a VIC inspection, ( csots about £40 to establish that the vehicle is what it claims to be ( Not a ringer)
Cat D is easily repairable, possibly not needing repair if you can live with dents and scratches such as if it had been stolen and recovered.