There's been some misunderstanding here. I'm asking does this statement fit reality:
Did the common sense of the populace lead to huge reductions in business which, supported by policies such as 80% furlough payments, lead to the majority of businesses temporarily shutting down of their own volition? It's not a hypothetical.
The 80% furlough scheme did not help business, it helped their staff; if there was a similar scheme for business it would of course have helped. The shutting down of businesses occured merely days after everyone was told social distancing would stem the tide. Again this was maybe a fortnight after Boris was shaking hands will everyone he met.
Therefore there's no data in terms of schemes that helped businesses as there currently are none, there's very little data in terms of how businesses would react if they hadn't been forced to close down prior to knowing the seriousness of the UK infection as days before the shutdown we were told to merely social distance and the second government properly articulated the seriousness was the day they closed businesses.
What we do know is how businesses that haven't been forced to close have reacted and my view is private industry have reacted phenomenally. Supermarkets have enforced social distancing, they've given time slots to NHS workers, they're prioritised deliveries for the vunerable and housebound. Pharmacies have done likewise as have others. The minority of construction sites that have stayed open have enforced similar measures (the majority that couldn't enforce them closed of their own volition and are only opening once they can ensure site safety). These businesses have received no compensation for their increased operational costs but have still been great on the whole. I see no reason why the businesses that were forced to close wouldn't have reacted in a similar fashion to those who have been given the opportunity to stay open; especially if they had the support to finance these operational costs.
The industries that have reacted poorly are arguably the public sector ones that are open and have been supported by government. The NHS have been awful in distributing PPE, public transport have crammed people onto busses and tubes; reducing services rather than expanding them.
So again I'd say the evidence we have shows private industry who've been allowed to operate have performed phenomenally well and I therefore see no reason why businesses that were forced to close wouldn't have done likewise.
I imagine if restaurants remained open we'd have seen most closing but some delivering meals to the vunerable at reduced or no cost; whilst aggressively enforcing the same measures as supermarkets and pharmacies. I imagine if clothing companies had allowed to remain open most would have closed but some would have enforced social distancing and put a portion of their resources to manufacturing PPE to be distributed at a subsidised cost.
Hell I imagine if testing were privately manufactured (ala US and Germany) and available many businesses would be purchasing thousands of tests and being a key part of the countrywide testing effort, providing both employee and customer peace of mind.
You say look at the evidence... Which businesses who could have exploited their ability to stay open have done so without regard for public health?