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The answer is closely related to the different levels of emphasis placed on "grounding" safety in the two countries, differences in electrical system voltage, and plug specifications. UK wall sockets must have a complete three-prong structure because: the UK uses a 230V voltage system, which is higher.

UK electrical plugs have individual fuses. If the socket cannot control the power supply, the likelihood of the fuse blowing due to overload or sudden failure increases. By using UK wall sockets with switches, power can be disconnected when plugged in or not in use, reducing the burden on the plug's fuse.

In the UK, whether a wall socket has a switch depends on electrical design codes, the type of socket, and its intended use. Many people believe that a switch is standard on UK wall sockets, but in reality, it's not mandatory.