Home office ergonomics: how to work from home without breaking your back

As I sit on a garden chair with my laptop perched on an outdoor table in a last-ditch effort to stop my dog digging the lawn, it’s timely that I’ve been asked to write about setting up a home workstation that doesn’t ruin your back, for people self-isolating during the coronavirus crisis (come to think of it, my back is aching a little).

So, how can I fix it?