Here is an example of some good advice for small business, the Health & Safety Executive has a web-page called “Myth of the Month“, you should have a look at it .
One myth I would have believed is the myth of the month July 2007:
The myth: All office equipment must be tested by a qualified electrician every year.
The reality: No. The law requires employers to assess risks and take appropriate action.
HSE’s advice is that for most office electrical equipment, visual checks for obvious signs of damage and perhaps simple tests by a competent member of staff are quite sufficient.
There are more “Myth-Busters” on the web-site.