I have just tried this out myself and it worked ok for me, I put in a reg of a cat N car, and it came up as cat N, then put in a reg of another vehicle I know to be HPi clear, and it came up clear (ie, NO MARKER FOR CAT N OR CAT S)
You need to go onto the Auto trader web site and click on sell my car, it will then ask you to put the reg. no. and mileage of the vehicle in the box's, then click on create your ad.
It then goes to another screen where it says find details, where it tells you the make, model, engine size, etc,etc.
Now click on next step, at the bottom of the page, this takes you to a page where they give you a price guide to put your car, this is as far as you go, on the right side of the page is a section which tells you about your car, and if it says nothing about cat N or cat S, the car is HPi clear.
And there you have it.... A FREE HPi check....
You need to go onto the Auto trader web site and click on sell my car, it will then ask you to put the reg. no. and mileage of the vehicle in the box's, then click on create your ad.
It then goes to another screen where it says find details, where it tells you the make, model, engine size, etc,etc.
Now click on next step, at the bottom of the page, this takes you to a page where they give you a price guide to put your car, this is as far as you go, on the right side of the page is a section which tells you about your car, and if it says nothing about cat N or cat S, the car is HPi clear.
And there you have it.... A FREE HPi check....