The Department for Business, Energy and Industrial Strategy is updating this guidance from time to time.  You can find the latest version here.

Generally

5 steps to working safely - Working safely during coronavirus (COVID-19) - Guidance - GOV.UK
Guidance to help employers, employees and the self-employed understand how to work safely during the coronavirus pandemic.
For All Businesses
Vehicles - Working safely during coronavirus (COVID-19) - Guidance - GOV.UK
Guidance to help employers, employees and the self-employed understand how to work safely during the coronavirus pandemic.
For Any Work Vehicles

Workplace-Specific

Construction and other outdoor work - Working safely during coronavirus (COVID-19) - Guidance - GOV.UK
Guidance to help employers, employees and the self-employed understand how to work safely during the coronavirus pandemic.
Construction & Outdoor Work
Factories, plants and warehouses - Working safely during coronavirus (COVID-19) - Guidance - GOV.UK
Guidance to help employers, employees and the self-employed understand how to work safely during the coronavirus pandemic.
Factories, Plants & Warehouses
Labs and research facilities - Working safely during coronavirus (COVID-19) - Guidance - GOV.UK
Guidance to help employers, employees and the self-employed understand how to work safely during the coronavirus pandemic.
Labs & Research Facilities
Offices and contact centres - Working safely during coronavirus (COVID-19) - Guidance - GOV.UK
Guidance to help employers, employees and the self-employed understand how to work safely during the coronavirus pandemic.
Offices & Contact Centres
Other people’s homes - Working safely during coronavirus (COVID-19) - Guidance - GOV.UK
Guidance to help employers, employees and the self-employed understand how to work safely during the coronavirus pandemic.
Working in Other People's Homes
Shops and branches - Working safely during coronavirus (COVID-19) - Guidance - GOV.UK
Guidance to help employers, employees and the self-employed understand how to work safely during the coronavirus pandemic.
Shops
Restaurants offering takeaway or delivery - Working safely during coronavirus (COVID-19) - Guidance - GOV.UK
Guidance to help employers, employees and the self-employed understand how to work safely during the coronavirus pandemic.
Restaurants, Takeaway & Delivery