Yes, a short extra piece of wire (4" long?) between the earth terminal of the socket and the earth terminal/lug/screw at the very back of the metal box.
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Changed double socket but unsure if earthing is correct?
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Yes, a short extra piece of wire (4" long?) between the earth terminal of the socket and the earth terminal/lug/screw at the very back of the metal box.
It is the Earth to the socket that provides the safety Earth for appliances that are plugged in the socket.
This Earth connection may have to carry a large amount of current if ( when ) an appliance becomes faulty and develops a Live to Case fault. This current has to be large enough to trip the MCB ( assuming no RCD ) to disconnect the Live . If the Earth connection wire is too thin then the wire may melt before the MCB trips,
When such a fault happens then without the Earth connection to the socket's Earth terminal the case of the appliance would become Live and anyone touching it could receive a serious ( maybe fatal ) electric shock.
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