Earth bonding is an essential part of your electrical installation. This must be confirmed right at the start of the incoming electrical supply and include metal gas and water supply pipes, the fuse board and be acomplished through an approved type of "earth" facillity. Using the local water suppliers pipe is no longer acceptable.
It is now a requirement for all final circuits to have a protective conductor alltough you will still find some lighting circuits without an "earth" cable. These circuits should only have double insulated fittings and non metalic switches fitted and consideration should be made to have an earth cable ftted.
Helios electrical services can upgrade or amend you system for you as required. Please call to discuss.