Insurance write-off categorys:
A - Usually fire damaged (burnt-out), flood damaged, or severely damaged with no servicable parts.
B - Damaged beyond economical repair and/or severe structural damage.
C - Damaged, but repairable. Generally applied to older vehicles.
D - Slightly damaged sometimes stolen and found after claim has been paid or high cost of repair combined with difficulty obtaining new parts to enable a swift repair.
Hope this helps. I had to research this last Easter when I bought my Panda, because the HPI showed it to be a category 'D' car.
Paul