Government Advice:

COVID-19:Working safety during the coronavirus (Guides for different types of work are available)
COVID-19: Closing certain businesses and venues
COVID-19: Cleaning of non-healthcare settings outside the home

Public Health England:

Customer logging toolkit

Chartered Institute of Environmental Health:

Legionnaire's disease - lockdown risks and reopening safely
Reopening salons and spas following lockdown: reducing risks of COVID-19 and other considerations

Health and Safety Executive:

What to include in your COVID-19 risk assessment

For the most current advice on COVID-19 visit the .gov website
Additional information for food businesses can be found on this site.