I spent last week in the America. There was a time when this would not have been something to note because the job used to take me there quite a few times a year. No longer. Although I’ve been on a handful of flights since lockdown began, they’ve all been comparatively local hops. The last time I stepped off an aircraft from far, far away was at the end of 2019. So I returned from the US on Friday feeling fully refreshed, having proven yet again that a change really is as good as a rest. Saturday was fine, then on Sunday I started to feel just a little off colour.