But the unions argue it is a health and safety issue.

BBC: UK work time opt-out under threat

There are also exemptions for blue badge holders and for the use of a hosepipe for cleaning in some situations where health and safety is an issue.

BBC: Q&A: Hosepipe bans

Only this week, a major debate began on stress in the workplace, an issue which has divided health and safety experts.

BBC: Stewing in your juices

In October 2009, the Occupational Safety and Health Administration (OSHA) said it would soon issue a "compliance directive" to ensure that health-care facilities have controls in place to protect workers from occupational exposures to swine flu.

CNN: STORY HIGHLIGHTS