I'll just clear this up and post the (full?) list of the monarch's powers as published by Parliament and viewable in that link Donkey Toon posted:
That list doesn't even mention the C of E which is another major hold the monarch has on what happens in the country. The whole thing is pretty much shrouded in mystery because, for the most part, the Queen doesn't exercise these rights too heavily and so everybody assumes she is powerless. The point is though, the monarch can do it, which means it will always be possible in future unless changed.
Which is why I oppose the monarchy. It is bad enough that the monarch technically has the power to circumvent democracy, but to continue with a system which suggests that somebody has the automatic right to rule a democratic nation because of the notion that they have divine right is both undemocratic and ridiculously outdated. Monarchal succession and divine right are medieval concepts that any right thinking country should have put to bed along with slavery or unequal rights for women.
As for the Head of State also being the Head of a Religion, don't get me started.

Got Princes Charles and Philip mixed up!
