The UK doesn't have a set back-up plan when a prime minister is unwell, but there are clear procedures in place.
To understand what is going on, it helps to look back at past leaders and their first secretaries.
History shows us that when police forces apply the rules unevenly, some groups are hit harder than others.
As someone who researches and teaches leadership, I’d argue New Zealand Prime Minister Jacinda Ardern is giving most Western politicians a masterclass in crisis leadership.
Much is known about the new leader's career but very little about his political positions.
Politicians have a tendency to dodge accountability after crises, but our 'gotcha' culture makes that inevitable. We can all do better this time.
Initially spoken of as a puppet chancellor, the newcomer seems to be coming out better from this crisis than other ministers.
The coronavairus outbreak is a challenge to government that it, in itself, diminishes Thatcher's comments of the 1980s.
Can a prime minister work from home?
The particulars of the British political system come into play at times like these.
It was a matter of 'national importance' to the British government that men they sponsored be the first to conquer the mountain.
New legislation gives the government power to clamp down on public gatherings – but the changes have a time limit.
Should parliament close because it's important or stay open because it's important?
There are good reasons to call off a vote during a pandemic – but other good reasons to push ahead.
Participants were asked to choose between white and ethnic minority candidates.
The question is: how long will Rishi Sunak last?
This is Boris Johnson's first major cabinet reshuffle since the Conservatives' general election victory.
There seems little chance of getting people to agree on the big picture, but even partisans see eye-to-eye sometimes when you get down to the nitty gritty.
Labour's leadership election is about to enter its final phase – but will the winner command the support of MPs?
The US research funder is widely admired, but does the UK have the guts to start its own version?