The position remains, as outlined on gov.uk, that everyone who can work from home should do so.
Where that is not possible, people should go into work where it is safe and they are not symptomatic, isolating or shielding. Relevant guidance including from PHE should be followed.
In terms of the provision of education for certain workers, it is already the case that cleaners working in, for example, hospitals and social care could be eligible as long as "their specific role is necessary for the continuation of this essential public service". This is set out on gov.uk.
The Government has placed restrictions on the operations of certain businesses as part of the strategy of enhanced social distancing. Separate guidance has been published on this and is also available on gov.uk.