A locking panel socket for making an electrical connection with a line plug, the locking panel socket comprising: - a socket connection portion, the socket connection portion having an end face and the end face having a plurality of recesses (10, 10') for receiving corresponding power pins of a line plug; - a plug insertion channel, the plug insertion channel extending around the socket connection portion; - a panel portion, the panel portion defining a plane and extending around the plug insertion channel; - a locking mechanism which, in use, engages with an inserted power pin of a line plug to restrain said line plug from being withdrawn from at least one of said recesses (10, 10'), the locking mechanism being provided within the socket connection portion; - a release mechanism for releasing the locking mechanism to permit said power pin to be withdrawn from said recess, the release mechanism including an actuation portion and a linking portion that links the actuation portion with the locking mechanism; wherein the socket connection portion, plug insertion channel and panel portion share a common main body, and the actuation portion is manually accessible on said panel portion and the linking portion extends from the actuation portion to the locking mechanism, and the linking portion includes on opposite sides of the plug insertion channel a first portion located within the panel portion of the panel socket and a second portion located within the socket connection portion of the panel socket, said first portion being a rod that terminates with the actuation portion, characterised in that the linking portion is separated from the plug insertion channel by walls in the main body, namely a base wall of said channel and two opposite side walls on opposite sides of said channel such that the linking portion extends around said walls from the actuation portion to the locking mechanism, and the first portion extends away from the actuation portion in a first direction transverse to the plane of the panel portion and the second portion extends in a second direction opposite to the first direction towards the locking mechanism, the arrangement being such that the actuation portion, when manually pushed, causes the rod and the second portion both to slide in parallel directions against respective ones of said side walls to disengage the locking mechanism from the power pin of a line plug. - a socket connection portion, the socket connection portion having an end face and the end face having a plurality of recesses (10, 10') for receiving corresponding power pins of a line plug; - a plug insertion channel, the plug insertion channel extending around the socket connection portion; - a panel portion, the panel portion defining a plane and extending around the plug insertion channel; - a locking mechanism which, in use, engages with an inserted power pin of a line plug to restrain said line plug from being withdrawn from at least one of said recesses (10, 10'), the locking mechanism being provided within the socket connection portion; - a release mechanism for releasing the locking mechanism to permit said power pin to be withdrawn from said recess, the release mechanism including an actuation portion and a linking portion that links the actuation portion with the locking mechanism; wherein the socket connection portion, plug insertion channel and panel portion share a common main body, and the actuation portion is manually accessible on said panel portion and the linking portion extends from the actuation portion to the locking mechanism, and the linking portion includes on opposite sides of the plug insertion channel a first portion located within the panel portion of the panel socket and a second portion located within the socket connection portion of the panel socket, said first portion being a rod that terminates with the actuation portion, characterised in that the linking portion is separated from the plug insertion channel by walls in the main body, namely a base wall of said channel and two opposite side walls on opposite sides of said channel such that the linking portion extends around said walls from the actuation portion to the locking mechanism, and the first portion extends away from the actuation portion in a first direction transverse to the plane of the panel portion and the second portion extends in a second direction opposite to the first direction towards the locking mechanism, the arrangement being such that the actuation portion, when manually pushed, causes the rod and the second portion both to slide in parallel directions against respective ones of said side walls to disengage the locking mechanism from the power pin of a line plug.