How to get rid of a serving Prime Minister
The linked article in the Independent shows how strong the position of the Prime Minister is even if a majority of his or her party's MPs want him/her gone.
In a sense it is a sign of our constitution that tends to concentrate power in individuals. I take the view that this is not helpful for good government.
What it does is increase the power of the civil service and paid officers against the electorate whose representatives are the back bench MPs or Councillors.
The European Commission is essentially unaccountable as it is established by horse trading amongst governments.