Re AC @ 15:20
"You're forgetting that the law is whatever the Government of the day says it is. They could quite easily make a law which says that anyone found voting against them will be sent to the labour campst."
No they couldn't. You're just making shit up.
There is an upper chamber to review all legislation coming from the commons (although Labour reduced their power). If, after its been rejected several times by the Lords, the commons force it through, it still has to be singed off by the Monarch before it becomes enshrined in law. No Monarch would ever sign such a law and would immediately disband any government that attempted to pass such a law. That's precisely why such a system is FAR preferable to a Republic where, potentially, the same party could gain complete control of all levels of legislature and force through whatever it wanted.
By having an independent body (the monarchy) a lid can be kept on the government and ensure they act for the people and not themselves.
Okay, I didn't say it worked perfectly, but that's the theory.