So the missus' boss has ordered all staff to continue working

from the office from tomorrow.

As it's not an essential service / business, I believe this will be unlawful. Am I right?

From the new rules:

Going to work
To help contain the virus, everyone who can work effectively from home must do so. Where people cannot do so - including, but not limited to, people who work in critical national infrastructure, construction, or manufacturing - they should continue to travel to their workplace. This is essential to keeping the country operating and supporting sectors and employers.

Posted By: jamesward, Nov 4, 10:45:28