Hart became a personal political advisor to Ian MacGregor then - Chairman of the National Coal Board and a close friend of Hart 's brother .
David Hart , the CFB 's chairman , was active in the miners ' strike , supporting miners who opposed strike action .
chairman became a personal political advisor to Ian MacGregor then - Chairman of the National Coal Board and a close friend of chairman 's brother .
David Hart , the CFB 's chairman , was active in the miners ' strike , supporting miners who opposed strike action .