"It's not that we want to know what he thinks ( we know a lot of that already!!), but how he is using his position to gain 'audience' with Ministers."
Let's be realistic for a moment. if you loved your country deeply, and cared passionately about certain issues, and were the heir to the throne, wouldn't you use your position to get your views across to Ministers?
Charles can't go onto a current affairs programme and be interviewed about his views on government matters, and he can't write about them in newspapers or magazines - in fact he has fewer opportunities to get his feelings across than many journalists and TV pundits. He tries to compensate by writing to Ministers, just as you or I could do, and frankly I say good luck to him. At least he's trying, which is a lot more than you can say about a lot of other people.