Current legislation states that it is a requirement that commercial properties and properties where the public have access are regularly checked and that an EICR (Electrical Installation Condition Report) is performed on the electrical services.
The combination of the Health and Safety at Work Act (1974) and the Electricity at Work Regulations (1989) make it a requirement to inspect and test all types of electrical equipment in all work situations as there is a duty of care to ensure the safety of all persons using the work premises and to prevent, so far as reasonably practicable, such danger.
There are many reasons not to do periodic electrical test and inspection such as cost, inconvenience or lack of knowledge. However none of these reasons will be accepted as a defence in the event that an accident or fire occurs. Aside from the threat of prosecution in the event of injury or death, surely the safety of your colleagues, employees, visitors or belongings are reason enough to test and inspect electrical systems at work.