As I write, Boris Johnson is in intensive care at St Thomas’ Hospital, battling with coronavirus. For someone with such an unwavering belief in his own destiny, this must be profoundly difficult. He is a man who’s beaten the odds over and over: to become mayor of London in a Labour city, to lead the Leave campaign to victory in the teeth of overwhelming opposition, to become prime minister in spite of all his personal baggage, and then to win the largest Conservative majority since 1987.

Less than three weeks after Andy Burnham was elected mayor of Greater Manchester three years ago, the city was hit by the terrorist attack that claimed 22 lives at an Ariana Grande concert. Now Burnham is facing a very different sort of crisis as corona-virus sweeps through the north-west. Manchester is about two weeks behind London in the epidemic curve. We had first met in his office to talk about the city and its politics.

The American economist and historian Robert Higgs noted long ago that during the 20th century the various wars, and the various declared equivalents of war, such as against drugs and viruses, regularly led to permanent expansions of state power. Power is the ability to coerce physically, war being the pre-eminent coercion. There has to be some reason that citizens of the UK and US are coerced to pay about 40 per cent of GDP for the wars and other activities of the state, whereas a century ago they paid about 10 per cent.

What’s the best way to keep in shape during the lockdown? That’s the First World problem I’ve been using to distract me during these strange, distressing times. My wife and teenage children are doing online workouts, but that looks far too tiring. Instead, I’m walking round Britain — in my back garden. I got the idea from a walking trail called Walk the Planets, in Ruislip Woods, not far from where I live. It’s a round trip of about two miles, which doubles as a tour of the solar system.