As an employer, you must protect people from harm. This includes taking reasonable steps to protect your workers and others from coronavirus.
Using a COVID-19 risk assessment can help you manage risk and protect your employees. You can download a free template here: https://www.tsesolutions.co.uk/2020/10/26/covid-19-risk-assessment/
Whilst you may have measures in place, it is also vital that you are managing the risks through REGULAR reviews.
Consider a review if your workers have spotted any problems or there have been any accidents or near misses.
You must then update your risk assessment record with any changes you make.