Many commercial buildings in the UK require an Energy Performance Certificate when it is constructed, sold or let. >Portable appliance testing or PAT Testing is the process of checking electrical appliances for safety through a series of visual inspections and electronic tests.
The best way of ensuring that your appliances are safe is to have a PAT test carried out on them. This is a good way for landlord to ensure that they are meeting their legal obligations to maintain high standards of electrical safety in their rented property.
To establish the safety and suitability of your electrical appliances, the competent person will carry out a visual inspection of the appliance, its plug and lead. For Class I  equipment they will also inject test signals into the cable and appliance to ensure their integrity
Electrical work must only be carried out by people who have the necessary knowledge, skill and experience needed to avoid danger to themselves and others.
Many registered electricians will carry out portable appliance testing. You can find a registered electrician here
If you are not technically aware, then the contractor / competent person who carried out the inspection and testing should be happy to talk through your report with you and advise you of any further action required.