What are the health and safety regulations with respect to people working with visual display units?
That is a slightly bigger Question than some of the Answerers seem to think. Please look at the HSE (DSE) site for the correct information in an easy Guidence Note. Everything that you need to know in order to comply with the Law is in the Display Screen Equipment Regulations 1992, published by the Health and Safety Executive. The HSE web site has very clear guidence notes, but they’re quite large. There’s no point in copying them directly into this answer so if you follow the link it will take you straight to the full, clear and correct answer to your question. http://www.hse.gov.