These regulations apply to anyone landlord who lets accommodation which contains electrical equipment. It covers any electrical equipment between 50 and 1000 volts a/c and requires that the apparatus to be safe and tested regularly by a competent person. The regulations do not, however, give any clear indications as to how often checks need to be made in order to be 'regular', nor stipulate any criteria that make a person competent.

The main things that you need to ensure are that the electrical equipment is:
Adequately protect against dangers such as overloading, through insulation and earthing;
Constructed in accordance with good engineering practice;
Accompanied by instruction booklets or clear instructions.
 
There are some simple checks that you can perform yourself to ensure that any equipment is compliant with the regulations:
Heating appliances should be in good working order, as should other domestic appliances such as washing machines, tumble dryers, microwaves, fridges, freezers and cookers;
Leads should not be worn or frayed;
Live and moving parts should be guarded and not easily accessible;
No wiring should be accessible or visible;
All plugs should be fused and BS1363 compliant;
Fireguards should be BS3248 compliant;
Fire extinguishers should be BS6575 compliant.