Queen/king endorse prime minister?

Question

can the queen or king one day actual endorse a person runing to be prime minister in britian

I cant remember if the royal family is allowed to get involed like that

Answer 1

if the king does it,nobody can prevent him.

Although this seems rather improbable.

Answer 2

In theory, it's the monarch who picks the PM, by asking someone to form a government.  But in reality they have to choose the leader of the party who got the most seats in an election.  There have been a case or two there the leader of the party with the most seats can't form a government and asks the monarch to dissolve parilament for another election.  But the monarch instead asks another leader to try and form a government.  But the monarch has very little movement in practice, it's almost impossible to imagine a case where the monarch would get involved like that.