[malermeister]

The King could dissolve parliament.

[yrro]

Doing so without being advised to by the PM would trigger a major constitutional crisis.

[lamontcg]

I entirely forgot about King Charles III:

https://www.imdb.com/title/tt6253522/

[m_a_g]

I thought the King can only dissolve the government.

[nirimda]

The King doesn't dissolve the government. The King can dissolve parliament and dismiss the government. If the King dissolves parliament, the people have to elect a new one. If the King dismisses the government, the King must immediately appoint a new one.