In a busy office or guesthouse is normal that your appliances will be dropped, kicked or suffer general wear and tear. Plugs will become damaged and can lead to fire.
The UK Health and Safety Executive along with insurance companies will expect you to perform PAT testing to ensure that you are compliant with certain regulations including:
Health and Safety at Work Act of 1974
The Electricity at Work Regulations of 1989
The Provision and Use of Work Equipment Regulations of 1998
The Management of Health and Safety at Work Regulations of 1999
Most insurance companies will also stipulate that Pat Testing is a requirement under their policies.