If you're a mid-size "non-essential" chain, you could have anywhere from a few dozen to hundreds of shops, all costing money but lying empty.
Any help for employees is at least a month away.
So you've got no money coming in, rent and other bills due immediately, and wobbly support somewhere down the road.
That's the day the Brexit transition ends. That's the day your supply chains break, if they involve the EU in any way, shape or form.
Will an "all clear" siren sound in every corner of the UK, and people will swarm back to the shops and spend like nothing ever happened?
What about the millions who lost their jobs, or saw their hours cut?
Or do you throw your hands up and cut your losses? (The business is gone, but at least your own assets can be saved...)
And when things finally get back to "normal", we will discover just how far from the old normal our new normal really is. (Very, I fear.)