'Bonding' comes in 2 forms. Main and supplementary.
Main bonding occurs at the point metal service pipes enter the property and connect them to the main earth terminal of your consumer unit.
Supplementary bonding connects metal pipes within the bathroom to the CPC of all circuits entering the bathroom.
Both are very important so I advise that you get a qualified and competent electrician to update these for you. If you wish to do the work yourself however, have a look here and here.
The bonding in the bathroom is probably referring to supplementary equipotential bonding: clicky
The kitchen may be referring to main equipotential bonding: clicky
P.S Does anyone know what has happened to all the useful info from the NICEIC website? It's all disappeared (or I'm just not looking in the right place )
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