Thanks again - found this leaflet
http://www.hse.gov.uk/pubns/indg95.pdf
It is directed at safety of employees, but will apply to safety of visitors to premises too, as all Health and Safety regs do.
I wondered why I was not aware of these COSHH regulations before, because I once was responsible for maintenance of a government building, and they were 'red hot' about conforming to safety standards.
Then I noticed that the first legislation was passed soon after I retired.