Who takes power if the British prime minister is killed?

Question

Dont worry im not planning anything stupid. Im writing a fiction story for class and it involves matters of this subject. So who takes power and how quickly of his death?

Answer 1

Mugabe of Zimbabwe will take over and it will be immediate, move in to 10 Downing Str.

Answer 2

Whether killed or retired like Blair, the sovereign of the UK appoints a ne Prime Minister who comes from the Majority Party in Parliament.

Answer 3

?

The deputy prime minister.

Answer 4

Depends on who kills him

Answer 5

The Queen.