Mark Sedwill did have Coronavirus roughly at the same time as the PM.

Number 10 failed to come clean on this in those critical moments. They say the cabinet secretary was working from home as normal despite the disease.

But it seems an extraordinary failure of transparency

The PM’s spokesman suggested that he heard about Mark Sedwill having their disease from journalists which is ....

.... a reminder that in really tough times the British state is not a beacon of transparency