assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/874732/230320_-Revised_guidance_note-_finalVF.pdf
As you can see, and similar to the ‘school closures’, there’s still quite a lot of leeway in terms of what’s permitted. Eg it says places of worship can remain open for solitary prayer, includes things like ‘home and hardware stores’ as remaining open, etc