Well, here is my experiance!!
I had replaced my rotors a little over a year ago. I also bought them from atlantic british. I have noticed the pulling, but no grooves. The disks did however become warpped. I am unsure if it is because of inferior metals, or because there was a bad batch, or perhaps even my calipers were bad. I did notice some pulling and excessive brake dust about 5 months after I put all new rotors and pads on. The pulling started then. I had this discussion with atlantic british, and they have sent me new front rotors this week. Just to be safe, I am replaceing all front calipers BEFORE I put the new rotors on. I am starting to believe there was a bad batch of rotors. According to the guy I talked to at Atlantic British, these are supposed to be very good quality rotors. That is why I believe I got a replaecemt for free. Good luck on this problem.
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Eric The Red
93 Range Rover Classic 
We will never "arrive" so the goal is to keep moving forward on our journey so we can periodically declare, "I am not what I want to be, but I am not what I used to be!"
96 DISCO SE7 5-SPEED SOLD 
....okay  couldn't live without a disco!
96 DISCO SD 5-SPEED
-ARB Bumper
-OME 2" Lift
-2" spacers
-Safari snorkel
-15" steelies
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