Firstly, below is the official HMG guidance on travel for business and citizens to/from Italy:·  British nationals travelling to Italy: FCO travel advice (in English). Linked to the gov.uk COVID-19 page (see below)·  All travellers to the UK: gov.uk COVID-19 (in English) ·  All travellers to/from Italy: FCO Coronavirus (COVID-19) in Italia page (in Italian)
Secondly, Public Health England (PHE) has issued best practice guidance for employers and businesses on COVID-19. The guidance gives headline information about the disease, advises staff on how to prevent the spread of all respiratory infections, what to do if someone with suspected or confirmed COVID-19 has been in a work place setting and what advice to give individuals who have travelled from the countries in the CMO's categories within the last 14 days. 
Lastly, DIT has set up a business helpline to help companies working with China to adapt in light of the difficult situation. It’s now been extended to support UK businesses working with Italy / Italy businesses working with the UK as well, if they have specific questions about covid-19. For now the helpline address is: DIT.China@fco.gov.uk