The logic behind this is: 

"An occupier would save 20% of their cleaning and maintenance costs because they had no need for this on Monday and Friday.

More significantly, they would also save 10% of their power costs. It wouldn’t be a 20% saving because a minimum base level of power would be needed to power servers, but at a time of soaring energy bills this would be a big boost to the bottom line.

Air conditioning could be cut as a key feature, and there would also be savings on other utilities such as water."

Having offices open for only three days of the week would concentrate the contact time with colleagues, potentially enhancing collaboration, team spirit and the benefits of learning by osmosis. 

But what would a recognition of the in-person three-day working week for office workers do to the wider economy, i.e. the rail, bus and tube operators, sandwich shops, dry cleaners/cobblers, city centre restaurants and bars whose pricing mechanism is predicated on sales for a full working week?

What tension will there be with flat sharers if the office worker is at home with the heating on Monday and Friday, whilst the junior doctor is at the hospital at least five days a week?

And will the Thursday morning hangover become the new normal as Wednesday becomes the night out with colleagues?