Employers and employees should be practical, flexible and sensitive to each other’s situation when working from home.
ACAS offer free and impartial advice on workplace rights, rules and best practice.
https://www.acas.org.uk/working-from-home
You may be able to claim tax relief for some of the bills you have to pay because you have to work at home. From 6 April 2020 you can claim can up to £6 a week tax relief on your work expenses to cover your additional costs if you have to work from home.
To find out if you are eligible and how to claim visit : https://www.gov.uk/tax-relief-for-employees/working-at-home