I was driving along the motorway at 110 right on the speed limit and i saw a Police motorcycle coming up behind me. Out of 4 lanes i was in the second to the left. I indicated to overtake the car infront of me, changed lanes and no way did i cut him off. Then he gets much closer behind me and im looking in the rear view mirror at him........ hes shaking his head at me. Then he goes to overtake me and i look across and hes still shaking his head at me.. what the hell did i do wrong? didnt indicate enough, came out of the lane too quickly or do something stupid i didnt notice?