I've lifted the full details from the Dealer Portal :
In readiness for the addition of Category C & D labels to adverts shown to buyers on Auto Trader next week you'll see an icon appear next to these adverts in Portal from today onwards.
For the full details on the automatic identification of these vehicles to buyers please read the information below.
Helping car buyers make sense of Insurance Categories
To help buyers compare vehicles fairly on Auto Trader, we're making some changes that may affect how some of your adverts are displayed.
From the 23rd April 2014, we'll be using MIAFTR (Motor Insurance Anti Fraud and Theft Register) data to automatically identify cars on Auto Trader that are in Insurance Category C and D.
What will change?
To give buyers more information about vehicles they're interested in, we'll add a label to all adverts for Cat C and D cars on Auto Trader.
As we do not allow Cat A or B cars to be advertised, any we identify will be blocked during the ad creation process. Category A and B vehicles are only salvageable for parts so cannot be advertised with us.
Why is this happening?
To build trust in you — and in us. We've found 73% of consumers would trust a dealer that clearly identifies Cat C and D cars. By being upfront about your cars, we'll help you secure more sales.
To simplify the legal side of things. You're already required to declare Cat C and D cars to buyers. We're simply automating that process for cars advertised on Auto Trader.
To help buyers understand. We'll explain each Insurance Category clearly. Confusion puts consumers off, but once they understand the implications, more buyers would buy a Cat D vehicle.
What you can do
If you have Cat C and D cars advertised on Auto Trader, it’s a good idea to provide as much information about the car’s condition as you can. It remains the advertiser’s responsibility to ensure that all information given in adverts is accurate and up to date.
Label on advert in search results
Label on full page advert
The below images display how the categories are explained to buyers on a full page advert on a mobile device