Why do they need to be checked?
If you are having an alteration or addition made to your electrical installation, your electrician must first check (as well as other things), that the earthing and bonding arrangements you have are up to the required standard. This is because the safety on any new work (however small), will depend on the earthing and bonding (as does the safety of your existing installation).
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What is Earthing?
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What is Bonding?
Bonding is used to reduce the risk of electric shock to anyone who may touch two separate metal parts when there is a fault somewhere in the electricity supply or electrical installation. By connecting together the particular metal parts with bonding conductors, bonding reduces the voltage there The two types of bonding normally used are main bonding and supplementary bonding. Main bonding is always needed. You may need supplementary bonding for rooms containing a bath or shower, except where all circuits in the room are RCD protected and the main bonding is up to the required standard.
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