Son brought a CAT N car without knowing, 2yrs ago.

[Tom Lee Pettimore]

As DX100 has already pointed out, category N is non structural , ie cosmetic damage it means the car has had a very minor accident in the past that wouldn't affect it's safety integrity or roadworthiness.

 

It will affect the price because it's registered and accident repaired, but as cars get older, this becomes less significant. All you can do is chalk this up to experience, you could have done what your buyer did and checked the car's HPI report when you bought it.

 

Ultimately though if you've had the car for a while, had good use out of it then what did the  category N status matter?,  it's only an issue now when trying to sell but what i suggest is to put in the advert that the car is cat N, explain what this means and then you'll only get inquiries from people who (rightly) aren't bothered by this.