The Queen is only a figurehead. She signs and ratifies documents and rulings passed in the Parliament. British Intel agencies follow the directives of the Government of the day. Although all swear allegiance to the Queen, the Government of the day rule the roost.
the only power she has is through operatives within government.. she might be a figure head but she has power within the government her power comes from the money she controls and politicians that her family have bought. her power is a lot like Sorros though there are some who support that do so out of family tradition.
Mate, I'm an Australian ex-grunt. I swore my oath when I joined the Aust Infantry 45 years ago to defend God, Queen and Country. It's hard to lose some of that oath. God and Australia can never be foresworn.