northwichcat
Veteran Member
The Prime Minister is appointed by the Monarch and is simply the person who can command the confidence of the Commons. Of course, this is almost always the leader of the largest party, but it could be a Lord, or even someone not in either Houses of Parliament at all!
The current PM makes an appointment to see the Queen and recommends to the Queen who the new PM should be and these days the Queen pretty much always does what politicians request that she does. That wasn't the case with Queen Victoria who withdrew a request to make Robert Peel PM after he asked her to put more wives of Tories on her staff and who also rejected all the original options put forward when she was asked to select a new capital city for Canada.