THIS guidance will assist employers and businesses in providing advice to staff on:

the novel coronavirus, COVID-19
how to help prevent spread of all respiratory infections including COVID-19
what to do if someone with suspected or confirmed to have COVID-19 has been in a workplace setting
what advice to give to individuals who have travelled to specific areas, as outlined by the Chief Medical Officer
advice for the certification of absence from work resulting from Covid-19

https://www.gov.uk/government/publications/guidance-to-employers-and-businesses-about-covid-19/guidance-for-employers-and-businesses-on-covid-19