I have Googled but it's difficult to find exact answers as to the queen's constitutional powers, as there is no written constitution - more unwritten rules and precedent. For example, I know that the queen can technically refuse to sign a law, but what would happen if she actually did? Would parliament then move to take that power away from her? I believe the queen has not been able to dissolve parliament since 2011.
I guess my question is, how much of a safety net does she actually represent? How about the (random) scenario that we elected a 'bad' government that tried to pass a crazy law saying that citizens had to sign in at police stations every month so the gov could keep tabs on everyone. Say the queen refused to sign the legislation so it couldn't be passed. Then the government acts to remove the need for the queen to sign the laws. Isn't this the type of thing a neutral non-political head of state should protect us from? Can the queen effectively protect us from that any more?
If not, what's her purpose? Advisory only? If so, is she better placed to advise governments that anyone else? Is her only value that she is unelected and lifelong - ie has a long-term interest in the UK rather than being concerned with short-term political gain?
Sorry if a bit rambling! What are your thoughts, whether you're a constitutional expert or not? 