This is taken from one of the mirror articles, for those who don't know why he writes some of his letters.
If Charles meets a little old lady in a care home who's been treated badly he'll make sure the Government knows about it. If he goes to a school and sees that kids are being bullied he'll write to Ruth Kelly. If he's got a complaint about traffic congestion he'll bollock Alistair Darling. And if he believes there's a scandal afoot with GM foods he'll tell the media because he doesn't want it brushed under the carpet