First of all don't cc to anybody else. Because as he told you a few times already he's not going to read stuff that has been copied to other people. Second, be brief: Prime Ministers are usually, but not always, busy people. Third, don't mention that you intend going on a hunger strike because that would make him go absolutely ballistic. But if you can't resist squeezing that in make sure to add a paragraph praising his dad for something the latter did or didn't do. The other thing to...
Tell you what. Got to run right now. So I think it's easier for you to have a model of how to write to everybody's favourite uncle. Just click on the image below. See ya!