Step 1 of the UK government’s plan for rebuilding and recovering from the coronavirus pandemic, will apply from Wednesday 13th May in England. 
Step 1 states that: 

• Workers should continue to work from home rather than their normal physical workplace, wherever possible. 
• All workers who cannot work from home should travel to work if their workplace is open. Sectors of the economy that are allowed to be open should be open, for example this includes food production, construction, manufacturing, logistics, distribution and scientific research in laboratories. The only exceptions to this are those workplaces such as hospitality and non-essential retail which during this first step, the Government is requiring to remain closed.
• As soon as practicable, workplaces should follow the new “COVID-19 Secure” guidelines.
• It remains the case that anyone who has symptoms, however mild, or is in a household where someone has symptoms, should not leave their house to go to work. Those people should self-isolate, as should those in their households.

As the rate of infection may be different in different parts of the UK, this guidance should be considered alongside local public health and safety requirements for Scotland, Wales and Northern Ireland.