It was Colin Graves. Interesting column from KP
...I'm afraid, as everyone can clearly see, this is the biggest load of rubbish. I had two phone conversations with Colin Graves and he was crystal clear in saying I had to get a county, score runs and that there was a clean slate. He said that when he comes in as chairman he wants the best players playing for England. He told me that on the phone in two separate conversations. He also repeated it to national newspapers.
http://www.telegraph.co.uk/sport/cricket/kevinpietersen/11600580/Kevin-Pietersen-My-fury-at-England-deceit.html